Adam Chambers

Agent Hotchner revisits the first case he worked at the BAU, when details come forth that one of the deadliest serial killers in New England's history has struck again after a 10-year hiatus.

A covert identity created for one of Gibbs' undercover cases 20 years ago resurfaces, when a murder victim is found living under the alias.

After a rise in deaths caused by black market opioid use, the team links the street drug to funding for terrorist activities.

The team joins forces with the FBI when a Marine is murdered by nerve gas, and Deeks shares his dream of quitting law enforcement to open a bar.

Horatio finally learns the truth about what happened to his brother, and the repercussions will change his life forever.

Rush and the team search for the truth behind the apparent suicide of a famous Philadelphian disc jockey in 1958.