Fort Lauderdale, Fla. ? A third teenager was charged with murder Tuesday in a string of beatings of homeless men last week in Fort Lauderdale.

William Ammons, 18, was charged with killing Norris Gaynor, who was bludgeoned with a baseball bat and died of head injuries. Police said Ammons shot the victim with a paintball gun.

Ammons initially had been accused only of assaulting another homeless man. He was released from jail on bail on the assault charge but was arrested again later on the murder charge.

Ammons, Brian Hooks, 18, and 17-year-old Thomas Daugherty were all arrested in connection with three beatings of homeless men Thursday, including Gaynor. Hooks and Daugherty also face murder charges in Gaynor’s slaying.