The Mentalist Season 5 Finale Spoilers: Red John Kills Someone From Jane's Past

The Mentalist will wrap-up its fifth season on Sunday, May 5 on CBS. If you're hungry to know the next step of Jane in finding the elusive Red John, keep reading for the spoilers revealed by TV Guide --

Red John Rules

As Patrick Jane narrows down his list of Red John suspects, the serial killer strikes another pointed blow at Jane by killing someone from his past. (Look for some familiar faces from Jane's carnie days to show up again.) But will Red John's most recent murder be the one that does him in? "This season has been about Jane digging into the notion that it's not that Red John could be anyone; it's that Red John is one of a very specific set of people that Jane is uniquely qualified to investigate," executive producer Tom Szentgyorgyi says. "The finale is going to pay that off in a way that will completely change the hunt for Red John. We are going to know some very specific things about who he might be."

An all new The Mentalist airs on Sunday with S05E21 titled "Red and Itchy". Watch the extended promo released by CBS below: