J. McCloskey
Background
J. McCloskey is a cowboy in Lincoln County, New Mexico.
During the events of Young Guns (1988) played by Geoffrey Blake
J. McCloskey walks up to John Tunstall's property and tells John that L.G. Murphy fired him and he is looking for work. One evening John takes the Regulators into town for a New Year's dance. William H. Bonney meets Pat Garrett and tells McCloskey that someday he will more well known than Pat. As John and the Regulators are riding back to their property, they see some Prairie Grouse and chase after them. As they are hunting the grouse, a group of Murphy's men ride up and shoot and kill John. After John's funeral, Alex McSween convinces Justice Wilson to deputize the Regulators.
The Regulators head to a location where Henry Hill was last seen with a woman named Janey. Dick Brewer hands William the warrant for Henry's arrest and tells him to give it to Henry. William goes inside the outhouse and when Henry goes to pee, William shoots him dead with his gun hidden by his crotch. The people in the bar hear the gunshot and a shootout starts and five of the bar patrons are killed. Dick yells at William for killing Henry, but William just laughs. Later, Doc Scurlock reads a newspaper article in which William is given credit for all the killings, and called the leader of the Regulators. As Morton and Baker are tracking the Regulators, they are ambushed by them. Baker tells them that when they killed Henry they started a war, but Dick responds that they started the war when they killed John. Morton points out that the Regulators are heavily outnumbered, but Dick says that they are still taking them to jail. William talks about killing them, but McCloskey argues against it and suggests a new rout straight to Lincoln County. William accuses McCloskey of being a spy and shoots him in the head.