Leroy is a police officer in the LAPD. He shares the same last name as another Patrolman, Levon Tate. He also shares a similar appearance due to sharing the same actor. They are presumably twin brothers.
Events of L.A. Noire
He also appears in the Homicide street crime Honey Boy where he witnesses an angry husband trying to kill his wife. He is the only patrol officer to not get shot because he escorts de Facto's wife to safety while the police storm the house.
He also appears briefly in the Arson case "Nicholson Electroplating". When a small explosion is caused after Cole does an experiment for Ray Pinker, Leroy is one of the officers who rushes to the basement.