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According to legend, he killed 21 people, one for each year of his life, but the New Mexico Tourism Department puts the total closer to nine.

I never heard that Billy the Kid killed any women, so they could have said men, instead of "people".

Four confirmed personal kills. Frank "Windy" Cahill at Ft. Grant, AZ. Cahill was known to bully the kid and the kid, after one incident, took retribution. Joe Grant in Ft. Sumner, NM. Supposedly, playing poker with the Kid (unknowingly), Grant boasted he'd kill the Kid on sight. The kid asked to look at Grant's revolver, using the ruse to move the cylinder to it would fire on an empty chamber. It did, the Kid's didn't. James Bell and Robert Ollinger, the two deputies assigned to guard the Kid at the Lincoln County Jail (the former Murphy/Dolan store) in Lincoln. The Kid acquired a pistol, or got hold of Bell's pistol, and shot him in the back stairwell. He then got hold of Ollinger's shotgun (which Ollinger had left at the jail while taking other prisoners across the street for a meal), and shot him from an upstairs window as Ollinger ran to see why the shot had been fired. There were other shootings, to be sure, in which he was involved, and in which he likely was at least partly the cause of someone's death. Bill Morton & Frank Baker, Sheriff William Brady & deputy George Hinman, possibly Buckshot Roberts. But these are the four directly attributable to him. If there were others, and there may have been, they're not part of the record...