josh mankiewicz (voiceover): it was a horrible, bloody scene.e mockbee's battered body >> -- it was a horrible, blood scene. body on the floor of the warehouse, a plastic bag over her head. bruce mcmahon stalled with a county sheriff detective called to investigate. they saw the bloodstains on the hallway carpet, and concluded michel had been dragged around the corner of her office. the office itself was locked, but there was fresh prime marks on the door. it looked like an attempted break-in. >> what was in that office that anybody would want? >> that's the mystery. >> while the detectives were trying to make sense of the crime scene, michel's husband dan was still at home. coworkers has started reaching out to him, but all they told him was there had been some kind of incident at the warehouse. >> and that's when i started getting nervous. >> dan rushed to the warehouse. to detectives, he might have been the victims loving husband, or the perpetrator of an incredibly violent crime. right now, they didn't know much. after he was escorted inside

here's josh mankiewicz with the plot thickens. >> ready and action! >> action. it ranks second only to money. i as the single most important word in hollywood. and here in l. a., where life and art are often the same form, there is a real life drama that rivals in the action movie with a plot that includes all the element of a classic film noir. >> a mystery, featuring an assassin, a femme fatale, a hollywood star, and a stunt man who takes the fall. and as for the money, we will get to that. let's start with the biggest name on the marquee, joe pesci. famous for his roles as a cold blooded killer. this drauma would costar pesci ex-wife, who appeared with pesci in the film casino. it includes claudia's brother, now the nectar, but an actual tough guy who did time in prison. and someone who harbored a terrible secret in his past. and finally, claudia second husband, garrett warner, a hollywood stuntman in martial arts expert, a man very familiar with danger. faith in. early evening in the quiet lake of west lake village, california, outside of l. a.. stunned then

josh mankiewicz: february 17, 2012... years after marie singleton's body was discovered, her husband andre went on trial for her murder. >> it might be hard to accept, but that man murdered his wife, and he needs to be held accountable. >> in the weeks leading up to trial, prosecutor john lewin wondered if his star witness would show up. >> he wouldn't even come out here. >> marcus was terribly conflicted over the guilt he felt at not speaking up sooner and the love he still felt for his stepfather andre. he didn't like the idea of testifying against andre? >> no, he did not. >> but a day before opening statements, much to lewin's relief, marcus did show up for trial, but he was to say the least a reluctant witness. >> in the beginning when i first came to speak with mr. lewin, i defended andre on my family's side and i didn't want to believe that he did it. then i found out that i'm probably going to have to accept the truth, a truth that i really don't want to have to accept even today to be honest. >> marcus told the j

here is josh mankiewicz with "unraveled". >> there is an argument. >> for an agonizing stretch of nearlydays, the fear was palpable and paralyzing. >> the twist and turn stone and there. >> a killer was on the loose, in and around phoenix, arizona, systematically shooting innocent victims. >> a massive manhunt underway. >> police worked around the clock, desperate for leads. >> we are asking the public to remain vigilant. >> a long weekend of terror that would lead to a hard question -- did any of it have to happen? because this was a tragedy many people saw coming. including the first and most high-profile victim. >> he was like nobody else might ever met, and that's true to this day. >> back in 2002, natalie collins was a young lawyer defending a medical malpractice case when she met a forensic psychiatrist named dr. steven pitt. >> it is a very intellectually honest whether you wanted his opinion or not, you've got it. but he was formidable and he was fair. >> it was nationally known for his work on cases like the column line massacre and the murder of jonbenÉt ramsey. his interest in

josh mankiewicz: larry hoagland... >> larry hoagland.tery man using larry's wi-fi. larry told us, a man named indian joe could confirm his story. >> hey. how's it going? >> you're joe? >> yes. >> and much to our surprise, indian joe turned out to be real. >> and he left it on all night for us. we could do our e-mails, surf the net, whatever. it was kind of nice. >> nice guy? >> nice guy. really, a nice guy. kind of, a -- kind of, larry milk toast. kind of, really, quiet. >> so far, this part of larry's strange story checked out. but what about the crucial part that larry promised would exonerate him and prove he had been framed? >> larry tells us about a guy named jerry who was like you. somebody who came up, parked nearby, used the wi-fi signal. a guy who was about-6-feet tall. dark hair like mine but maybe darker than mine. wavy hair. slender build. ringing a bell? >> somebody fitting that description? no. i have known everybody that comes around. and there was nobody -- there was nobody fitting that description. >> do you know anybody