FORT LAUDERDALE, Fla. -- Police said the third teenager charged with murder in connection to the beatings of three homeless men used a paintball gun in one of the attacks that killed one of the men.

William Ammons was originally charged with aggravated battery causing bodily harm or disability, but Tuesday afternoon police announced that he would also be tried for murder.

Thomas Daugherty, 17, and Brian Hooks, 18, turned themselves in Sunday in connection with the series of brutal baseball-bat beatings that killed one homeless man and seriously injured two others.

Police said Ammons gave them Daugherty's and Hooks' names.

All three face murder charges in the death of 46-year-old Norris Gaynor and aggravated battery charges in the videotaped beating of Jacques Pierre, 58. They are also suspects in the beating of Raymond Perez, 49, authorities said.

Police said Ammons admitted he shot Gaynor in the torso with a paintball gun while Daugherty bashed Gaynor's skull with a bat. Police said Ammons also admitted that assailants used his black 1997 Chevrolet in at least two of the attacks, police said.

At a bond hearing Wednesday, Ammons' public defender argued that his client shouldn't be held without bond -- standard for a murder charge -- since his alleged actions didn't cause Gaynor's death.

"He should be given a bond consistent with an aggravated battery, not charged with premeditated murder," attorney Michael Glickstein said.

But Assistant State Attorney Lee Cohen said even though Ammons didn't cause Gaynor's death, Ammons was acting with a person who did. Under Florida law, people who take part in a crime can be charged with murder if someone is slain, even if they didn't commit the actual killing.

"It doesn't matter how he actually died as long as they were working together in committing the crime," Cohen said.

Circuit Judge Steven P. DeLuca agreed with Cohen and ordered Ammons held without bond.

DeLuca had already ordered Daugherty held for 21 days under juvenile detention and to undergo a psychological examination.

The attorney for Hooks said Tuesday there is no evidence that his client struck anyone.

Hooks may have been present and holding a baseball bat when some or all of the three homeless men were beaten Thursday, but neither witnesses nor a videotape of one of the beatings have him actually striking anyone, attorney Jeremy Kroll said.

He said two witnesses have told police that Hooks did not strike Gaynor, nor did he strike the man whose attack was captured by a security camera, Kroll said.

"It's very clear from the witnesses that Brian wasn't involved in striking any blows against Norris Gaynor," Kroll said. "And, obviously, the concern is for somebody to be charged with an open count of homicide and not to have acted in any way to have caused that homicide, obviously, is troubling to me."

Ammons had initially been accused of assaulting another homeless man and released on $5,000 bail, but was arrested again a few hours later on the murder charge.

Police said they have been speaking with a 16-year-old suspect whom they believe rode along on all the attack but did not participate in any. He has not yet been charged.