A key witness in the murder case against Arizona stockbroker Steven DeMocker speaks out on network television for the first time.

For six months, 48 HOURS Correspondent Maureen Maher and CBS News Correspondent Armen Keteyian have been investigating what's driving the murder rate in Chicago and claiming the lives of young people like Pendleton. Maher and Keteyian's reporting reveals a deadly link between street violence and drug trafficking in the city and in the suburbs.

Richard Schlesinger and 48 HOURS investigate the disappearance of the wife of a celebrated top chef and what ultimately drove him to dive off a California cliff.

CBS News' 48 HOURS reports on a Miami murder for money case hatched by a gang of bumbling bodybuilders so unusual that Hollywood decided to make a movie about.

Richard Schlesinger and 48 HOURS investigate the death of Angel Downs, a beautiful real estate agent who was found face up in front of her home dead from a shot to the head.

Troy Roberts and the 48 HOURS team report on the murder of a Florida father in a story that pits family members against each other and reveals a woman who has been harboring secret about what happened.

Erin Moriarty and the 48 HOURS team go inside the investigation of what authorities say was the oldest cold case ever to be prosecuted in United States history.

"Somebody broke into our house last night.. I don't know who it was, but they killed everybody here except my sister, my brother and me," Matthew says in in the 911 call. "I hear a couple of gunshots going through and some glass breaking and my grandma screaming that she's dying.".

Troy Roberts and the 48 HOURS team report on the murder of Novack. The broadcast includes the first interview with Rebecca Bliss, who carried on an 18-month affair with Novack while he was married to Narcy Novack.

David Ditto repeatedly told police that night that Karina's injuries were because of the fall, nothing else. "I heard the cat screech at the top of the stairs and I heard a horrible falling down the stairs," he tells 48 HOURS Correspondent Maureen Maher.. "And I jumped up and ran over, and found Karina laying at the foot of the stairs. She wasn't moving - wasn't talking.".

"What does a mother do when she's seen her daughter in a pool of blood,"

48 HOURS investigates Patterson's murder and follows the task force of FBI, U.S. Marshals and New Jersey Department of Corrections officers on the most intense manhunt of their careers. It's a story that spans five decades, involves a stunning airplane hijacking, covers three continents and touches multiple generations of one family shattered by the brutal murder.

"The day we found Mackenzie and we saw how brutally she had been murdered, we knew we were in for one tough investigation," Detective John Kruse tells Peter Van Sant.

On the morning of Sept. 11, 2009, Randone summoned police because Tang wasn't breathing. He maintained she overdosed on the drug GHB, which they both took before going to bed. However, police didn't buy the story.