Houston Knights S02E12 - Vigilante

A man who spends a lot of time in the Middle East comes home when he learns that his step father was killed when someone robbed his home. Upon arriving a punk tries to mug him so he dispenses some Mid Eastern justice by cutting off his hand and writing something on his forehead in his blood. When La Fiamma and Lundy find the punk they learn that what was done to him is done is a country in the Middle East, so they try to find out if anyone from there just came to Houston. Later the man is going after everyone who was involved with his step father's death by hanging them and drawing the character on his head. Along the way he kills an undercover cop.