The following regular cast members appear in this episode according to the Rizzoli and Isles Wiki :
(Bruce McGill) – Investigates the park scene and is nearly bitten by the witness. [S5E17] Bite out of Crime
The Boston Police Department investigates a series of sniper attacks in Franklin Park. The shooter is meticulous, leaving behind streamers to measure wind speed but very little forensic evidence. The first victim is killed instantly during a parking dispute, while a second victim, a stockbroker, is critically injured but survives. The following regular cast members appear in this
(Sasha Alexander) – Diagnoses the witness and deals with personal relationship shifts. while a second victim