u.s. officials said last year that they believed he was killed in a u.s. drone strike in syria. to california now, where driver fatigue is being eyed as a possible cause of that deadly bus crash. a passenger on the greyhound bus that crashed in san jose killing two people says the driver seemed to be nodding off before the crash. abc's david kerley for us. >> reporter: the overnight trip with that drowsy driver ended with the greyhound bus on its side in san jose. >> sounds like we're going to have multiple patients including a few 10-5-5s. >> reporter: that's the radio term for fatalities. two women dead, ejected from the bus. alex ellis was one of the 20 on board who said it sounded like a lightning strike. >> it was seesawing on the median. >> reporter: crews raced to the scene, providing blankets on the cold rainy morning. everyone on the bus was hurt, five taken to the hospital with life-threatening injuries. on average there are 35 deadly bus crashes a year-w more than 53 deaths associated with those accidents. and fatigue is one of the

biggest worries for safety investigators. >> the basic problem here is that most commercial transportation is 24/7 but humans are not. >> reporter: the ntsb is sending a full ten-member team to try and determine why a fatigued driver was at the wheel of that greyhound bus. david kerley, abc news, washington. >> well, the sheriff says searchers have not given up hope on finding a missing 2-year-old alive. even though it's been six days since he disappeared. hundreds of volunteers have been braving the brutal cold in rural tennessee. some 85 miles east of memphis. but it was too cold last night. professionals did take over. the sheriff also says the family is not uerer suspicion deite what you may read on social media according to them. now, that same blast of cold is moving east, picking up enough steam for what's being called a major snowstorm to hit later this week. tens of millions of americans could be walloped by a foot of snow or more along with frigid temperatures and gusting winds.

forecasters say saturday will be likely the worst day. mid-atlantic not looking good there, is it? >> stock up on groceries now. don't wait till thursday or friday. >> and your booze. well, it's not unusual for one minnesotan to pitch in and help a neighbor shovel the slow, unless the shoveller is 101 years old. richard mann, he knew that his neighbor in st. paul was traveling, so he took a shovel next door. >> that's really nice. another neighbor post the video on facebook. where it has gone viral. nearly 2 million views. mann says he can use the exercise and he knows his limitations. the irony is that the neighbors usually take care of richard mann's sidewalk. >> aw. you would have just handed him a bottle. >> i'll give you a dime. thanks, man, appreciate it. take on autism by going back to the diagnosis that changed history. as more and more families are affected by autism. but first, the bizarre and disturbing case of a teen accused of taunting her boyfriend, encouraging him to

commit suicide. the text messages prosecutors are pointing to. but at first a look at our forecast map. do you know mariah carey's legs are insured for a billion dollars? >> what does that have to do with weather? >> nothing. but -- >> announcer: "world news now" weather. brought to you by resolve. ♪ (ugh.) ♪ does your carpet ever feel rough and dirty? don't avoid it, resolve it. our formula with a special conditioning ingredient, softens your carpet with every use. it's resolve, so you know it cleans and freshens. but it also softens. resolve. a carpet that welcomes you. and to clean pet messes, try resolve pet expert. where do you think you're going? to work, with you. it's taco tuesday. you're not coming. i took mucinex to help get rid of my mucusy congestion. oh, right then i'll swing by in like 4 hours.

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new developments on the so-called affluenza teen being held in mexico. lawyers for ethan couch saying he will no longer fight extradition to texas. couch and his mother were arrested across the border last month. they fled to mexico as prosecutors looked into a possible probation violation stemming from the drunk driving accident that killed four people. no word on how long it'll be before couch is back in texas. we're going to turn now to

another teenager facing serious legal troubles for the part that she's alleged to have played in the death of her boyfriend. >> the 18-year-old is accused of taunting her boyfriend to commit suicide. prosecutors say that she pressured him to do it via text message and was even talking with him on the phone when he he ended his life. here's abc's linz yooie janis. >> reporter: massachusetts teenager michelle carter is one step closer to standing trial for allegedly convincing her 18-year-old boyfriend, conrad roy, to commit suicide. prosecutors arguing carter, now 18, encouraged him in dozens of text messages. >> she goes back, "when are you going to do it? stop ignoring the question." question mark, question mark, question mark, question mark. "you can't keep pushing it off." >> reporter: roy died of carbon monoxide poisoning in july 2014 after locking himself inside his truck in this kmart parking lot. at the time prosecutors say he was on the phone with carter for 47 minutes, at one point telling

her he was getting out of the truck because he feared it wasn't working. >> he was scared. she told him to get back in the car. >> reporter: and just days before, in another text message, carter writing, "don't be scared. you're finally to be happy in heaven." >> it's inconceivable. i just don't understand how someone could do that. to encourage someone they claim to love. >> reporter: according to court documents, roy had attempted suicide and had been hospitalized before he had even met carter. and in one text message two weeks before his suicide he expressed his desire to take his own life, writing, "i can't get better. i already made my decision." the defense now trying for a second time to have the involuntary manslaughter charge dropped. >> he has in fact brainwashed her to the point where she's now accepting his idea of this is my only option. >> reporter: in a statement to abc news the defense says, "michelle's communications were by no means threatening" and is

that "roy made his own conscious decision to take his own life." adding, "this is a tragedy, not a crime." linzie janis, abc news, new york. >> incredible. she'll be in court next month. could face up to 20 years in prison if she's convicted. >> it's such a horrible story. i've read all of the text messages exchanged between the two of them. and for many to say that she was not an enabler is very, very difficult after you read those messages. it was just so sad because she kept going at him to do it. >> what would motivate someone to do that? it's pretty remarkable. well, coming up, the first ever diagnosed case of autism. >> it was a diagnosis that changed one person's life. and the course of medical history and the mother who started it all. you're watching "world news now."

it's estimated more than 3 1/2 million americans live with the autism spectrum disorder. >> and those numbers are on the rise. but all of that stems from one diagnosis that changed the course of medical history forever. we're up all "nightline" with abc's juju chang. >> reporter: his name is donald triplett. in 1943 he was the first person ever diagnosed with autism, the

brain disorder that affects verbal and social interaction. and in many ways his journey from despair to hope mirrors the history of autism itself. >> all right. how are you doing today? >> reporter: finding donald was the culmination of 15 years of reporting for "nightline" correspondent john donvan and producer karen zucker. >> this little boy is named jake. >> reporter: among the first journalists to cover autism on network television, they began in 2001 with jake, this little boy undergoing what was then a relatively uncommon therapy called applied behavior analysis, or a.b.a. they explored the private thoughts of a young man with autism looking for love. >> do you like her? >> i said i love her. >> oh, you love her. >> but there's a problem. >> she don't love me back. >> she doesn't love you back. >> reporter: armed with their scripts, the duo have turned their first drafts of autism history into a comprehensive

book. "in a different key: the story of autism." >> your book is really a chronicle of a labor of love. >> "in a different key" is the story of all these unsung heroes who took their love and mobilized, literally. and any parent can relate to that. >> reporter: what are the future chapters in the history of -- >> adults. we have not looked at adults. >> as a society we have not -- but more or less we've said when kids we give them all these opportunities to have great adulthoods, then they turn 21 and all of that sort of goes down the drain in a lot of cases because people need continuing help but where are they? they're living at home with their parents often. and for those 40 years after school the person with autism has really not gone anywhere, not done anything. >> did you have a goal, john, going into the book? >> caren as a member of the community, at that time when we started out, you had a little

boy. now you have a man. i choke up over this. it's been a big -- >> what makes you emotional? >> her kid. i know that caren's always said what she wants is when her kid, now a man, is out there in the world that she won't be the only one who has his back. that it'll be everybody -- excuse me. and she wants this book to get people who read it to be willing to be those people, to be there for her kid. so i hope we did it. >> for "nightline" i'm juju chang in new york. >> see why we love john donvan. i think he's one of the most brilliant writers and journalists and you see his heart i think. $60,000 is how much it costs a family with a child with autism roughly. >> that's absolutely amazing. autism, by the way, now affects 1 in 68 children and 1 in 42 boys. it's definitely something that

will be with us for a while. >> thanks to caren and john for bringing this to our attention. really powerful. really powerful. igibility? you may think you can put off checking out your medicare options until you're sixty-five, but now is a good time to get the ball rolling. keep in mind, medicare only covers about eighty percent of part b medical costs. the rest is up to you. that's where aarp medicare supplement insurance plans insured by unitedhealthcare insurance company come in. like all standardized medicare supplement insurance plans, they could help pay some of what medicare doesn't, saving you in out-of-pocket medical costs. you've learned that taking informed steps along the way really makes a difference later. that's what it means to go long™. call now and request this free [decision guide]. it's full of information on medicare and the range of

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all night... or all day. ♪ ♪ with the lights out ♪ yes, it's dangerous ♪ here we are now ♪ entertain us ♪ i feel stupid i'm just doing the math. if you were a teenager when you were smelling like teen spirit back in '91 you're probably in your 40s about now. is that right? >> i wonder where it puts me. because i thought it was about the deodorant commercial. >> nirvana's teen spirit, a song for many generations to come. and for others that exuberance is a bit more sincere. >> ten years ago "high school musical" captured the hearts and minds of the nation's youth. abc's chris connelly caught up with the gang a decade later. ♪ together, together ♪ together everyone >> my heart is just bursting at the seams. it's just -- it's so crazy that it was ten years ago.

>> reporter: it's true. 2006 saw "high school musical" debuting on the disney channel and rocketing to the head of the class. ♪ here and now ♪ it's time for celebration its songs, dance numbers, and beloved characters creating a tweentastic phenomenon and turning its stars into overnight sensations. >> it was such a whirlwind. it felt like we were kind of swept up into this vacuum. at one point it literally felt like we were the beatles. >> reporter: this past weekend the cast, minus zac efron -- >> this is only ten years. let's have a billion more. i love you guys. >> reporter: -- reuniting to share fond memories for a disney channel tenth anniversary show on wednesday. >> what does it feel like to revisit a lot of where it all began for you? >> it's amazing. for me i kind of embrace the i want it all of shar-pei. and i'm doing it all. got a clothing line, a makeup line coming out. producing. the movie coming out in may. it's been insane. >> it taught me that what you do

is potentially going to impact people. >> just to come back into this room and to see everyone again and to go oh, my gosh, we were all part of this together, we made this incredible magic happen together. >> reporter: as they continue to work on projects from broadway and tv to the big screen, these actors reflecting on what made "high school musical" special. >> "high school musical" came out at the perfect time. we were found by fans seeking us out. >> we have tons of other friends, but they don't understand what we've been a part of. and it's like this connection between all of us. >> if someone comes into your life what do they have to know about this experience to understand you? >> that they all come with me. >> it's a package deal. >> it's a package deal. ♪ ♪ we're all in this together >> reporter: chris connelly, abc news, los angeles. >> do you remember watching it at all? >> i was abroad at that time period. so i missed that. but i will tell you even abroad in the middle east people loved "high school musical." >> popular.

>> very popular

this morning on "world news now" -- backing up trump. >> sarah palin going after the republican establishment, who she says is attacking their own front-runner. her major endorsement of donald trump coming at a crucial time in the primary race. and how ted cruz is responding. and for the democrats bernie sanders searches in the polls, taking a huge lead over hillary clinton. in the primary battleground of new hampshire. why clinton's camp isn't worried about that big number slide. the biggest phone scam in irs history. victims receiving phone calls from scammers posing as agents with threats related to their taxes. what the government is doing to stop it, and what you need to know about it. and say cheese. this morning we're celebrating america's favorite comfort food ingredient, cheese. we'll follow kendis into one of new york's bestpo