FORT LAUDERDALE, Fla. -- A third suspect was arrested Monday for his alleged role in the beating of three homeless men.

William Ammons has been charged with aggravated battery causing bodily harm or disability.

Police said Ammons, 18, gave them the names of the other two teens they say committed a series of brutal baseball-bat beatings that killed one homeless man and seriously injured two others.

Ammons is accused of being present for all three attacks and actively taking part in one of them, but not the attack that killed 45-year-old Norris Gaynor.

Thomas Daugherty and Brian Hooks face murder charges in the death of 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.

Circuit Judge Steven P. DeLuca ordered Daugherty, 17, held for 21 days under juvenile detention and to undergo a psychological examination.

The attorney for Hooks, 18, 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."

DeLuca ordered Daugherty and Hooks held without bond.

Hooks is being charged as an adult, but prosecutors have not yet decided whether to charge Daugherty as a juvenile or an adult. Neither has been charged in the attack on Perez.

Ammons was released Tuesday from the Broward County jail on $5,000 bond and is scheduled to appear in court Wednesday. No further court dates have been set for Daugherty or Hooks.

"The law certainly requires more than mere presence for someone to be guilty of a homicide," Kroll said. "Merely being present for someone else doing an act that results in another's death, this is not sufficient to charge them with murder."

A fourth person could also be arrested in connection with the beatings, police said.