What did the killer do in the days before being executed for the murder of 168 people? What was his last meal, last words and last activities?

It's been over 40 years since Jeffrey MacDonald was convicted of killing his wife and daughters. But he still claims he is innocent.

Family annihilation—wherein men kill their wives and kids (and, more often than not, themselves)—is so grotesque that it feels like it should only happen when a person is blinded by anger. But Chris Watts didn't murder his family in a fit of rage. We explore how his case breaks the family annihilator pattern.

On February 2, 2008, a man walked into a woman's clothing store in Chicago and shot and killed five women. It's one of the worst mass murders in the city's history, and the murderer is still on the loose.

The 2016 mass murder of seven members of a Pike County, Ohio family (plus a fiancée of one of the men) may become the largest homicide investigation in the state's history. After a two-and-a-half-year investigation, in late 2018, the Ohio Attorney General's Office arrested four members of another local family, the Wagners, for the murders. But what's the connection?

One element of the 1978 mass death at Jonestown that hasn't been explored much is leader Jim Jones' rampant drug abuse—and how he used substances as a tool of control in his church. A&E True Crime investigate the roles drugs played at Jonestown.

On July 20, 2012, 12 people were killed and dozens more injured at a midnight showing of Batman: The Dark Knight Rises, when James Holmes opened fire in an Colorado theater. We spoke with forensic psychiatrist Dr. William H. Reid, who did extensive interviews with Holmes, about the mass shooter's mental state.

A&E True Crime spoke with Marcus Parks—whose podcast "The Last Podcast on the Left" ran a special on Jonestown—to learn more about the last fateful hours of the men, women and children who died that tragic day.

Experts weigh in on whether the 918 people, including almost 300 children, who died during the Jonestown massacre were victims of suicide or murder.