|Plot details follow, read at your own risk.|
- "You're a funny guy, Roy. Haven't I always said what a funny guy Roy is, and how much fun it would be to get together with him sometime?"
- ―Johnny Stompanato
Johnny was born to an Italian-American family in Illinois on October 10, 1925.
In 1943, Stompanato joined the U.S. Marines. He saw action in the South Pacific theater, in Peleliu and Okinawa, and then landed in China with the Marines, in 1945.
After the war, Johnny moved to Los Angeles where he became the bodyguard and right hand man of mobster Mickey Cohen.
Events of L.A. Noire
He can be seen in the newspaper in "The Fallen Idol", he introduces Sheldon to Cohen. He is next seen in the newspaper in "The Black Caesar". He opens the car door for Cohen and then stands by his side during the meeting with Sheldon and Kelso. He is also seen in "The Set Up" at the fight alongside Cohen.
During the Vice case, "Manifest Destiny", Cohen was questioned about his involvement in the murder of Eddie McGoldrick. Stompanato was by his side during the interview and he and Cole had a brief conversation about the war.
Johnny Stompanato was killed on April 4, 1958, when actress Lana Turner's (whom he had a relationship with) daughter stabbed Johnny in the chest when he appeared to attack her mother. His death was eventually ruled a justifiable homicide, and Turner's daughter was acquitted.
After the ruling, Stompanato's family sued Turner for $7 million; gangster Mickey Cohen supposedly paid the family's legal costs. The case was finally settled out of court.
Johnny Stompanato is interred at Oakland Cemetery, in Woodstock, McHenry County, Illinois. He is buried between his mother, Carmela (1890–1925), to the north, and his father John (1890–1952) and his step mother Verena (1901–1967) to the south. His brother, Carmine (1912–1961) is buried across a small road, to the west of Johnny.
- "The Fallen Idol" (Newspaper)
- "On your way out, tell your partner to get some new material. His act stinks."
- "Do us a favor. Vamoose, kid."
- Johnny is based on the real-life former United States Marine turned Los Angeles mob enforcer of the same name.