Steven Groves
Name: Steven Groves
Actor: Peter DeLuise
Dates: ???? - 2008
Occupation: FBI Deputy Director
Episode: 3.12 Jus in Bello
HISTORY
Henriksen calls in Groves to help expedite Sam & Dean to Nevada in 3.12 Jus in Bello. Groves turns out to be possessed and attempts to 
kill Dean before Sam fights him off. Partway through an exorcism, the demon vacates the host, leaving Groves dead.
Later in the episode, it's revealed that Lilith's destruction of the sheriff's office is held responsible for Groves' death.