Diagnosis: Murder

A priest kills his would-be blackmailers and does everything he can to cover his tracks. Dr. Sloan investigates when details don't quite add up.

Dr. Sloan is under suspicion after his tax preparer is killed with Mark spotted 'hovering' over the body.

Ashley York murders her wealthy father and cleverly manipulates it to appear as though he killed himself. Dr. Sloan picks away at holes in the story, which leads him directly to Ashley.

One police officer is accidentally shot by another during a raid gone wrong. Dr. Sloan investigates the victim's wife, the shooter, and a conniving lawyer when he suspects foul play.

Steve becomes embroiled in political intrigue after the murder of a city councilman's wife appears to be part of a larger political strategy. Steve investigates two mayoral candidates, the councilman and the chief of police, as well as a rogue detective and his partner, all with strong motives.

Mark, Steve, Jesse, and Amanda are all trapped in the rubble of Community General in the aftermath of the bombing. Mark tries to shake off the numbing effects of the explosion in time to save Amanda, who's suffering from a punctured lung and broken collarbone. After the dust settles, the hunt for Caitlin Sweeney begins. It's discovered that the Sweeneys belong to a terrorist organization, R.O.A.R.

A comedy roast in Mark's honor is ruined by a double murder.

Mark's office decorator is murdered.