Criminal Confessions

Kathy Chou was missing for more than a year before detectives got their first lead.

Gary Ridgway ultimately confessed to murdering 49 women, making him the most prolific serial killer in US history.

Jeramy Lee Kennedy claimed the murder was in self-defense.

Juan Gonzales Jr. testified that he had sat on top of Kathy Lujan and strangled her.

"You knew that was a grave. You just knew," said Detective Sergeant Mike Mongeluzzo.

On the day of his murder, Brad McGarry had left to meet "DJ," a married man with whom McGarry had been having an affair for "years."

"It was all premeditated. I knew what I was doing," he said.

The agent's emails contained a "very unusual type of writing and attitude from someone that would be a federal investigator of any sort."

From Executive Producer Dick Wolf, season 2 returns with more unsolved murders and shocking revelations.

These criminals just couldn't resist putting their crimes on social media.