The BAU travels to Chicago to investigate an unsub who leaves red roses on each victim; Rossi gets an unexpected visit from his ex-wife.
When mummified remains of victims are found in the walls of a home, the team track down a trail of clues that date back over 20 years.
Rossi prepares to marry Krystall, but first, the BAU team travels to LA to investigate a series of fatal shootings on the season finale.
Magnum tries to catch a killer, who may be praying on wealthy men, by posing as a doctor on the same dating app that a murder victim was using.
