welcome to "world news tonight." concert tragedy. the rising pop star gunned down as she signed autographs after a show. the suspect's photo just coming in. he was armed with guns, a knife and police say an intent to kill. tonight, the man police call a hero and the tributes pouring in. the urgent manhunt happening right now. two dangerous prisoners escape on a truck, one accused of a violent crime on the run. the other still at large, why it took authorities hours to realize they weren't in their cells. trump's tirade. >> i'm the least racist person. >> donald trump on the defensive, as some in his own party turn their backs on him. tonight, the big-name republican now threatening to vote for hillary clinton. the brazen attack.

a jeweller fighting off thieves. the fbi on the case. the new clues tonight. and an eight-feet deep sand tunnel collapses killing a teenage boy, the summer warning about this danger at the beach. good evening. thank you for joining us on this saturday. i'm cecilia vega. as we go on the air tonight, investigators are trying to understand why a heavily armed man opened fire on a young pop star just as she finished what would become her final performance. christina grimmie rising to fame on "the voice," was signing autographs when she was shot. the photo of the singer an a fan believed to be one of her last. police say the shooter traveled to orlando with the intent to kill her. grimmie's death stunning the music industry. quincy jones saying, too young and too much talent to leave us this soon. abc's lauren lyster leads us off. >> reporter: tonight, chilling new details about that concert horror.

authorities investigating why moments after this exuberant performance, a suspect they've identified as kevin james loibl, opened fire at singer christina grimmie, fatally shooting her. >> the four gunshots were like pop, pop, pop, pop. >> reporter: earlier friday night, no indication that the orlando venue would become a crime scene. ♪ i came in like a wrecking ball ♪ >> reporter: the 22-year-old, known for finishing third on "the voice," greeting her fans on twitter. >> we're in orlando today, please come to the show if you live near orlando, florida. >> reporter: after the show, autographs and selfies all while a man, carrying two guns and a hunting knife, has made his way past security. >> there are no metal detectors. people are not patted down. >> i'll never understand. what can you expect, you never expect someone to pull a gun out. >> reporter: two minutes later, authorities say the armed 27-year-old shoots grimmie leaving her critically wounded.

>> i walked into the room and there was no one in there except the gentleman performing cpr. >> reporter: her brother, mark, tackling the attacker, who fatally shoots himself. >> very heroic actions by marcus grimmie. >> reporter: grimmie is rushed to the hospital. overnight, the tragic news. her publicist announcing grimmie did not survive. tonight, authorities searching the attacker's phone and computer for a motive. >> it does appear that he came here to commit this crime. >> reporter: grimmie's death, leaving so many performers grief-stricken. pharrell calling it "a tragic loss," blake shelton saying he's "heartbroken." from selena gomez, "i miss you christina." the venue says it is cancelling all shows until further notice. tonight, instead of fans lining up to see a different group, there's line of flowers outside from people mourning grimmie's death. >> lauren, thank you. we want to turn to breaking developments in the manhunt for two escaped prisoners in nebraska. tonight, one of them back in custody.

accused of attacking two women while on the run. the convicted sex offenders may have been gone for hours before they were discovered missing on friday morning. abc's ron claiborne with the stunning admission from prison officials on the security lapse under their own watch. >> reporter: tonight, convicted sex offender armon dixon back in prison. after escaping from prison and allegedly assaulting two women. but fellow escapee timothy clausen, also serving time for sexual assault, still on the run. now the subject of an intensive manhunt, on the ground and in the air. >> it is one of the parties -- party in custody 4-9 in francis! >> reporter: officials say the two convicted fellons escaped from a truck when they left their high-security prison friday morning and allegedly stole a red pickup truck that was chased by police and then crashed. >> i knew that there was an accident. i basically thought that's all it was until i saw him running and until i saw the police

chasing and having the jaws out. >> reporter: but the two got away. tonight, corrections officer making the extraordinary admission -- two dangerous criminals were able to escape because of security lapses. >> my agency failed to carry out its mission of keeping the public safe. there are no excuses for this lapse. >> reporter: that official would not say exactly what security measures failed or how it happened. asked if those escapees had any inside help he would only say that's now the subject of a criminal investigation. cecilia. >> okay, ron, thanks. we want to turn to the race for president now. donald trump on damage control. today, calling himself, quote, the least racist person. but some members of his own party are now refusing to back him and one big name is now threatening to vote for hillary clinton. and today, she unveiled her latest attack, a donald trump parody. here's abc's mary bruce. >> reporter: back on the campaign trail tonight, donald trump is back to his old self.

no teleprompters and no holding back. >> everything's political correct, it's like a bunch of babies! like a bunch of dumb babies! >> reporter: ripping into hillary clinton and her new attack dog, massachusetts senator elizabeth warren. >> pocahontas! it's pocahontas. >> reporter: trump mocking warren for claiming she's of native american descent. >> yes, i'll apologize to pocahontas, i will apologize, because pocahontas is insulted by the statement. >> reporter: this, as more top republicans are turning their backs on trump. former gop nominee mitt romney says there's nothing trump can do now to win his support. >> presidents have an impact on the nature of our nation, and trickle down racism, trickle down bigotry, trickle down misogyny, all these things are extraordinarily dangerous to the heart and character of america. >> reporter: trump hit back. >> and then he says, "donald

trump may have racial tendencies," it's absolutely pathetic. he lost. he choked. >> reporter: and republican megadonor hewlett packard ceo meg whitman hinting she may actually vote for clinton and comparing trump to demagogues like hitler and mussolini. but house speaker paul ryan is defending his support for trump, speaking to abc's george stephanopoulos. >> the way i see it is he won the thing fair and square. >> reporter: and tonight, clinton out with this blistering fake infomercial for trump university. >> pay for trump university at the amazing price of everything you have! >> reporter: and the attacks are only going to get worse. starting on monday, when trump delivers a speech in new hampshire outlining why he says clinton is unfit for office. cecilia. >> mary bruce on the campaign trail again, thank you. tomorrow on "this week" more on the race for the white house. more from george's interview with house speaker paul ryan. turning now to the outrage over the stanford sex assault case. this, on the eve of graduation there.

brock turner sentenced to six months in jail. tonight, the calls growing louder against the judge in the case. many demanding that he be removed from the bench. abc's eva pilgrim with the latest. >> reporter: the campaign to oust the judge in the stanford sexual assault case gaining steam tonight. activists topping 1 million signatures demanding judge aaron persky step down. and now, a dozen california lawmakers pushing for an investigation into persky and for brock turner's sentence to be overturned. the former stanford swimmer will spend six months in jail for the drunken sexual assault at a university campus party. the prosecutor asked for six years. >> the sentence of brock turner is incredibly unusual. it's incredibly light and lenient. the prosecution did its job in prosecuting him. the jurors did their job in finding him guilty. what's unusual is this sentence. >> reporter: and tonight, new

questions about the probation officer's report given to the judge before sentencing. we're getting a glimpse into how the victim's life has changed. from her boyfriend. in a newly released court document he writes, the she often hides in the bathroom. more protests are planned tomorrow. we wnat to overseas to marseille, france, police using tear gas on crowds, water cannons, too, after violent clashes between rioting soccer fans. today's unrest came before the start of the european championship pitting england against russia. this man slamming another over the head with a chair. at least two fans are in critical condition. at least half a dozen people arrested. back here at home to a frightening scene in dallas,

texas, a brazen robbery caught on surveillance video. hooded thieves targeting a jeweller who stopped at a gas station. the fbi now investigating possible ties to another attack, that one with a deadly outcome. abc's gloria rivera with these chilling images. >> reporter: the bold attack happening in broad daylight. cameras catching a gold chevy impala at a gas station near dallas/ft. worth airport. police saying two masked men jump out to rob their victim, a new york jewelry dealer carrying valuable gems. seen running for safety. one suspect rifling through the victim's car. the other racing after the jeweller. the victim making a desperate attempt to get inside, as he's dragged on the ground. but then, just 30 seconds after it started, the attackers make a quick getaway. >> they were just screaming nonstop, help, help. >> reporter: authorities now saying this attack may have been targeted and possibly connected to a kidnapping this week in the same area.

that victim later died. >> but at this point, there's lot of similarities between the two cases. >> reporter: the fbi and the 6 local authorities are investigating, but no arrests have been made. the victim says while he's traumatized, silver lining, his attackers didn't get away with anything valuable. cecilia. >> gloria, thank you. there's new fallout by that bankruptcy filing by gawker, now struggling to stay in business after being ordered to pay millions in its court battle with prowrestler hulk hogan. but as linzie janis says, gawker says it's not dead yet. >> reporter: tonight, gawker media not backing down in its legal battle against hulk hogan. the company founded by ceo nick denton filing for bankruptcy protection in a last-minute maneuver to block the former wrestler just before he was able to seize its assets. >> well, they picked the wrong guy this time. >> reporter: the move comes nearly three months after gawker was ordered by a florida jury to pay hogan $140 million in

damages after the gossip website published a small portion of a sex tape. >> even if we would have lost, it would have been good because everybody would have known what gawker was all about. because i exposed them. >> reporter: and tonight, gawker is also setting its sights on billionaire peter thiel, the man who recently revealed he bankrolled hogan's case. apparent payback after gawker.com wrote an article exposing his sexuality. a source from inside gawker telling "abc news" that lawyers are exploring whether thiel's financial involvement broke the law. denton tweeting, "even with his billions, thiel will not silence our writers. our sites will thrive under new ownership and we'll win in court." whoever wins in court all eyes the case could have a lasting impact on privacy and the press. linzie janis, abc news, new york.

now to other trial, the trial of the century back in the headlines. tonight, new revelations about o.j.'s dream team of lawyers and how they worked the prosecutors and the jury to their advantage and then, there was that glove, it's all in a new documentary. and abc's juju chang is on the case that still grips the country. >> reporter: the trial of the century like you've never seen it before. from the infamous chase to the bloody glove that was never supposed to be tried on. >> i didn't want to do it. i knew it was a mistake. the latex is going to screw up the fit, they've shrunk. >> reporter: the rest is history. >> the rest is history. >> if it doesn't fit you must acquit. >> reporter: and a closer look at the jury who found the football superhero not guilty of killing his ex-wife. the l.a. county d.a. breaking his silence after 21 years. >> my belief is that they already had their minds made up before they went in for deliberation.

>> new details on their field trip to o.j.'s home where the majority african-american jury thought they got a glimpse of his life. >> what we did that day was create an illusion. we took all of his white friends down, put all of his black people up. pictures he'd probably never seen before. >> if we had had a latin jury, we would have had a picture of him in a sombrero, there would have been a mariachi band out front, we would have had a piñata at the upper staircase. >> reporter: that whitewashing of o.j.'s now-demolished estate here on rockingham symbolizes the racially polarizing defense strategy. the racial tensions with the lapd to win that not guilty verdict. cecilia. >> "o.j. simpson: made in america" premieres tonight at 9:00 eastern on abc. up next on "world news tonight" this saturday, the frantic attempts to dig a teenager out of a collapsed sand

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now to a tragedy at the beach. a high school junior on vacation in florida, buried alive by a sand tunnel. more from abc's adrienne bankert. >> reporter: tonight, an oklahoma teen has died after the walls of a tunnel he dug collapsed on him. >> all i could see were his feet sticking out. he was unresponsive. they called 911. >> reporter: 17-year-old trevor brown of oklahoma trapped in the sand cave on panama city beach, florida, as officials tried desperately to reach him. witnesses say medics worked to revive the teen for 20 minutes. in new jersey last summer, a 12-year-old boy survived after a sand avalanche crumbled right on top of him, trapping and knocking him unconscious.

officials say the boy was digging deep sand holes. and in 2011, 17-year-old matt meehan miraculously survived after a seven-foot-deep sand tunnel caved in on him in huntington beach, california, it took 27 minutes to dig him out. experts say digging deep holes can trigger the surrounding walls of sand to shift and give way. two things to remember. for you or your children, first, never completely enclose yourself in the sand. and if you're digging a hole make sure it's no more than knee deep. >> cecilia. sflmplt lot more to get to tonight. harry potter steps off the pages and the big screen and on to a theater stage. so, can a wizard do jazz hands? these little guys? they represent blood cells. and if you have afib - an irregular heartbeat that may put you at five times greater risk of stroke -

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as you can see behind me here the whole family was there today, lots of royal waving going on. and as abc's lama hasan tells us about this fun, it was a party fit for -- well, you know. >> reporter: the queen's very own birthday parade. >> may i wish you and the royal highness the very happiest of birthdays. >> reporter: her majesty standing out in neon green. choose the griet color so well-wishers could catch a glimpse of her. this is the moment everyone here has been waiting for, that famous balcony appearance.

the flyover our head. the queen flanked by members of the royal family. this year it's a little extra special because princess charlotte is making her debut. throughout 90 years the queen has witnessed history firsthand. from serving in world war ii as a mechanic in military truck driver to meeting 12 u.s. presidents in office during her reign and watching as beatlemania conquered the world. queen elizabeth ii has remain steadfast. >> as i learned from growing up you don't mess with your grandmother. and what she says goes. >> reporter: but she's a queen with a funny side. remember this. >> careful what you wish for. >> boom! >> oh, really? please. >> boom! she has that amazing ability to make anyone relax. >> reporter: a symbol of strength and unity not only for her family but for her country, too. lama hasan, abc news, london.

>> they are the best of the class. >> it's a post millennial generation with a whole new perspective on the election. >> the content revolution. and how they're giving back. i'm brian taff. >> and i'm sharrie williams. >> hello everyone and welcome to the best of the class. >> we are here at the adventure aquarium in camden, new jersey. >> this is 6abc's annual event honoring academic excellence all across our region. >> for over thirty years now, 6abc invites high school valedictorians from the tri-state area to celebrate their achievements! >> and tonight, we'll hear directly from them about who they are and what matters in their world. >> we'll peer into their life online via social media. >> and hear what they think of the country's current political landscape. >> plus, we ask them all about their future plans and how they'll strive to make a difference! >> this ought toe