Simon Baker and Robin Tunney Simon Baker and Robin Tunney

Teresa Lisbon, heartbreaker?

The Mentalist Exclusive: The Shield's Kenny Johnson to play Lisbon's ex!

On Thursday's episode of The Mentalist, Patrick Jane (

Simon Baker) and Agent Lisbon (Robin Tunney) investigate a surfer's murder. But as they begin questioning suspects, Lisbon is shocked to come across Greg Tayback (guest star Kenny Johnson), her former fiancé!In our exclusive first look at the episode below, Jane instantly seizes on the uncomfortable tension between Lisbon, Greg and his wife (Claire Rankin). When Jane stirs the pot by asking if Lisbon broke Greg's heart, it becomes clear that Greg's wife has heard far more about Greg and Lisbon's past than she wanted. Awkward!

Finale Preview: Get scoop on The Mentalist and 38 other must-watch finales

The Mentalist
airs Thursdays at 10/9c. Check out the sneak peek clip below: