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at good evening. thank you for joining us. tonight a terrifying home invasion. two sisters attacked by a man just days after he got out of prison. what happened next may take your brett away. and hopefully get you thinking -- what might you do? we begin with a chilling 911 call. >> what do you want? >> hello? >> what do you want? what do you want?

i'll give you anything you want. >> hello? >> reporter: frantic pleas for help as two sisters fight off a home intruder. >> i knew from her s seams -- it was s ly a c cple of s seams that i heard but from theeone of them i knew it was something terrible. >> reporter: these just-released 911 calls depict the horror last month when two young women, bri and kalie lasly, tried to wield off a knife-wielding intruder in their new s st lake city home. >> help us, help us please! >> reporter: the sisters had just said good night around midnight when 27-year-old bri says she heard a strange sound in her dark bedroom. >> i thought i heard something outside of my window. i wasn't really sure. just a few minutes later i heard someone say "hey, girl, i'm coming in." it was then n window o oned all the way and a man came in my window. >> reporter: the intruder, 48-year-old robert burger was

released from prison just one week before the attack. bugger had tried to break into a different home a few doors down on the very same block. >> yeah, i just had someone break into my house. >> tell me exactly -- >> he just broke through my kitchen window. >> when did this happen, how many minutes ago? >> two minutes ago. like -- i just grabbed my phone and my husband was fighting him out the window. >> reporter: later burger entered bri's window using this chair and broom. bri immediately began trying to fend him off. >> he said,ooperate with me. i said, i'm not coooorating with you, you're not going to get what you want out of this situation. and he put his hand over my mouth, shoved me up against my door, and started purge ded punching me. >> reporter: terrified little sister kalie runs to help. >> i ran into the fight. i didn't see them. i could just hear. all of a sudden i i was kind of inn the middle ofhe ght. >> reporter: the sisters say they barely had time to be afraid. all they could focus oh was

>> i remember squatting down and holding on to his shorts with my left hand and punching him as hard as i could with my right hand. and kalie was behind me just beating him over the top of me. >> i think he must haveve kickedd me down the stairs. i don't think there was any way it was a push because it was so much pressure on my chest. i flew backwards down the stairs. he's saying to us, just give me your car keys, i don't want to kill you, i don't want to rape you, just give me your car keys >> i il give you anythininyou nt, what do you wantnt >> w w said, y y can have your car keys, you have whatever you want, what do you want? then he just continued to beat us. so that's when we both had our need to call 911. >> hello? >> reporter: thehe say they and the suspecttought savagely,

kicking and punching, until burger pulled out a knife. >> and i heard briane say, kalie, he has a knife. >> i just remember, this can't happen. this nds to stop. but then i knew we needed help. and that it was going to end. it was going to end quickly and badly if kalieidn't leaveve and get help. because unfortunately i couldldt be the one to leave. and so i yelled at kalie to go and get help. >> she started screaming, kalie, he's stabbing me. >> he's stabbing my sister! he's stabbing her! >> we were both thinking the same thing -- >> it's the last time i'm going to see my sister. >> reporter: kalie makes a heart-wrenching decision to leave the house andnd ask for help. her terrifying screams awakening numbers. >> there is someone outside of my apartment screaming like bleed murder. she is screaming for help. as loud as she can. >> did you hear anything that was said or just the woman screaming? >> just -- she was screaming and she was screaming "help me." she's still screaming.

>> okok. >> i canan hear it,, shears still screaming. >> then i saw a few people come out of their houses into the street and that's when i started saying "he's stabbing my sister, he's stabbing my sister, he's going to kill her." >> reporter: salt lake city police officer ben hohn had been on the streets responding to another report of a burglary. he rushed into the lasly home after hearing kalie's cries for help. >> i remember looking a a the officer's eyes and saying, "officer, he's going to kill me." he shined a light on the suspect and said, "salt lake city police department, drop the knife, drop the knife." right when he flexed -- the officer took his life and saved mine. >> reporter: officer hohn fatally shot burger in the head. >> one female stabbed in the stomach. breathing. >> reporter: bri was stabbed three times in the thigh, the stomach, and sternum.

longer and she would have been killed. >> reporter: the girls say officer hohn is their hero. >> it's like -- we don't really have words for how much we love him. and his family. he really saved our lives. both of our lives. right there in that moment. >> reporter: bri and kalie's terrifying ordeal is just one of the latest in a series of recent home ininsions, violent attacks, intruders crossing the threshold into the place where we're supposed to feel safe, our own homes. according to the fbi, almost 2 million players occur each year. 60% involve forcible entry. in san jose, california, this homeowner watched on multiple home security cameras as an intruder broke into the home, even pulling on the door of the bedroom where she was hiding. >> i came outf my closet at that point and started banging on the door from the inside, yelling at him, "get out of

they're going to shoot ju." >> reporter: in central florida, men dressed like ninjas breaking in tying up the homeowowr. safety expert and formerraw enforcement officer steve cardian says, even though home invasions are rare, always have a game plan. >> what i suggest to people is, before something bad happens, create a plan of action. the minute they detect somebody in that house, they should code red, run to a safe room or run out of the house. but get away from him, far away. >> reporter: bri and kalie are recovering. both say they're lucky to be alive. >> i remember in the emergency room, they kept saying there's no way that didn't hit her aorta, there's no way theert no heart damage. >> reporter: they've since moved out of that house. >> we're blessed. to say the least. to say the very lelet. that's right. next, why controversial announcement about breast cancer screening is ignited heated

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we turn now to a major shift in how and when we look for breast cancer. a big announcementt from the american cancer society instantly met with criticism, even outrage, from women who say they owe their lives to early detection. one of those women, our own "good morning america" coanchor, amy robach. >> i'd be dead if i hadn't done that breast exam. >> reporter: jerilynn lucas 21 years ago, diagnosed with an aggressive form of breast cancer at 27 years old with no prior family history. >> i found a lump. i didn't realize that breast cancer could happen to a woman in her 20s. i thought a woman had to be 40 to get breast cancer. >> reporter: she underwent a single mastectomy anan extensive chemotherapy. she's been in remission since. lucas argues early detection was the key to saving her life. but just this week, the american cancer society making waves after they release new

with an average risk of breast cancer can delay having a mammogram until the age of 45, five years later than its previous recommendation of 40, a message that outrages lucas. >> i think this is such a disservice, adding to the confusion of when to get screened, when to get checked. i feel like we've made so much progress in genetics, in research in treatment. why are we going backwards? >> reporter: the american cancer society says thehe new guiuilines aree based in evidedee that mammography screening harps can include the risk of false positives innger women. >> there's a changing risk as you get older. these guidelines have given a roadmap that a woman can follow throughout her life span. begin the discussion at 40. but if you haven't started by 45, everyone should begin screening. thth's really the key take-home message. there is a chance, small though it is, that a woman could die because she did not begin screening earlier.

>> reporter: it's that chance that is leading the experts at memorial clone kettering cancer center to not follow the acs' new recommendations.s. >> the goall is not to decrease false positives, to decrease biopsies. the goal is to decrease deaths. that's why i think we are sticking with our guidelines, and that's why it concerns me that the american cancer society has changed theirs. >> having a mammogram once a year, starting at age 40, is the best way we know of to decrease deaths from breast cancer in this country. >> reporter: radiologist dr. carol lee says that the guidelines could lead to confusion among patients and dire. >> what i don't want to see is a reversal, going backwards, seeing more deaths from breast cancer because fewerer women get screened because they're confused about whether they need to have a mammogram. >> reporter: dr. wender says no

matter a woman's age she should still be mindful about your breasts. >> your risk of breast cancer starts even earlier than 30. so we encourage all women to be aware of what their breasts feel like andnd not to delay iff they find somethinghat they think might be a change. even if they're not sure. bring that to the attention of a clinician. >> reporter: there are questions like, will insurance companies continue to cover mammograms for women under the age of 45? cigna health insurance in a statement to abc news saying, cigna's breast cancer screening policy is 100% coverage for womemeage 40 and older. we have no plans to change our policy." >> my mastectomy, the day after my 20th birthday, realizing i would come out and there would be a chunk of myself -- i hadn't had any surgery, i didn't know what to do. >> reporter: today lucas is joined by a group of women -- >> my d dghter wendy had breast cancer. she passed away in 2009.

i say this is the face of young breast cancer. >> reporter: their stories hit close to home for me. >> now to a very, very brave moment, our dear colleague amy robach, she's one of the new staffers having a mammogram. >> reporter: in an effort to demystifyhe p pcess off breast cancer screening, i was asked to have my first mammogram live on abc. >> we're hearing the word stronger and you are being so strong today, amy row back. you're going to live have a mammogram. >> reporter: my reaction was visceral. no way, no how. >> she called me and said, them me to do a mammogram live on tv. and i sasa, i don't think thahas a good idea. it seems exploitive. cancer. it didn't seem authentic. >> reporter: the truth is i feared it would look like i was trying to grab the limelight. million my dear friend robin to hear. 85% of women who have breast cancer have no family history. that statistic sent a wave from my headdo mytoes. >> i went in to see robin, who is a breast cancer survivor and

what, amy? if one life is saved because of early detection, it's all worth it. >> reporter: i was 40 years old at the time. with no prior history of breast cancer in my family. and a life busy with work and kids. i had been putting it off for a year. i finally said yes. >> amy is wrapping up her firstst mammogram here in the mammo van. >> reporter: little did i kno that mammogram would change the course of my life. a few days later i received a call. doctors wanted to do more tests. and later, a sonogram. it was there. a dark spot on the screre. a tumor r out the size of a mamale growing inside me. those moments alone, scared in the doctor's office, detailed in my memoir "better." i wanted to stay positive so i kept telling myself that this was why some people argued against 40-year-olds getting mammograms. competitive testing, false readings, unnecessary anxiety.

they immediately performed a biopsy. there was no escaping my new unreality. i had cancer. >> i will remember that phone call for the rest of my life. i knew it was bad news. then she said, they found a tumor, and it's malignant. >> i have decided to have a bibiteral mastectomy. i'm going to be very aggressive. i'm 40 years old, i'm young, i have a lot of life ahead of me. >> reporter: the prognosis was chemotherapyeight rounds over six months. april 24th marked my final day of chemo. today i have made it my mission to raise awareness for early detection. it's a calling that geralyn lucas shares. she's the mother of two and author of a second book called "then came life: a warrior in the fight against breast cancer." >> i'm the lucky one. i have a 16-year-old daughter and a 9-year-old son. they were born in the same hospital where i had my mastectomy. and i have a life now. i'm the lucky one.

>> reporter: f "nightline," i'm amy robach in new york. next, around the world, the trivago guy. how he literally stumbled into fame. geico motorcycle, great rates for greaearides. this is my body of proof. proof of less joint pain. and clearer skin. this is my body of proof that i can fight psoriatic arthritis from the inside out ...with humira. humira works by targeting and helping to block a

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think of your favorite commercials and you'll probably spokesperson too. the right face c c make or break a company. so trivago definitely lucked out with the guy you're about to meet whose offbeat appearance in their first commercial had hilariously unexpected results. >> did youotice there's so

exact same room -- >> reporter: tim williams known as the trivago guy, slightly rumpled yet approachable. he's pitching good deals but it seems lots of people want to know what his deal is. >> i come from houston, texas. i made my wayp to new york a long time agoo to study acting. i worked on "my so-called life." i worked on "the sopranos." >> reporter: it's williams' commercial success that has women and men obsessing over his id-back look that a ao comes with criticism.m. >> from doug. tuck in your shirt, you badly dressed trivago guy. this is for you doug, is this enough? >> jimmy: are he joins the ranks of spokes people like progretsive insurance agent flo, world. making a career out of being the face of one company. how does this guy from texasnd up as t trivago front man? he moved to germany. >> my agents here in new york

are like, are you crazy? you don't speak german! i said, i do, i will, i don't speak but i'll learn it because i've not to work. eventually i ended upp on a television show. translates to "good times, bad times." i played an american rock star. and that's why i couldn't shave. i had to shoot on monday. on thursday and friday i had to shoot trivago. after doing fittings we realized that, okay, none of the belts seem t be fitting the loops. so we went out without the belt. >> trivago instantly compares prices -- >> reporter: a happenstance wardrobe malfunction put him in the world of advertising elite. >> meryl streep said, you don't haveveo be famous, you just have to make your mother and father prod of you. thank you for watching abc news. tune into "good morning america" tomorrow.

and abcnews.com. corrine, corrina, this fare you well..