20/20 on ID Presents: Homicide

In Jacksonville, Fla., four young black men listen to rap music in their vehicle at a gas station, then a middle-aged white man confronts them over the volume of their music and brandishes a gun, turning the dispute into a deadly one.

Unabomber Ted Kaczynski's brother and sister-in-law discuss clues, evidence and what went in to the decision to turn Kaczynski over to authorities.

Millionaire Marjorie Nugent is found dead in her freezer.

Bob Angleton, a bookie and police informant, is twice charged with killing his wife in a Texas tale of double crosses, adultery, blackmail, and murder.

A young woman is found beaten to death. Her coworker is found bound and bleeding. Detectives begin hunting for two masked men described by the sole survivor. But the evidence takes the investigation down an unexpected path.