Police said the attacks may be related but they aren't yet sure.
Two to four young white males were involved, police said. Officials released the surveillance video from Florida Atlantic University showing two men beating one of the victims with what appear to be bats.
Norris Gaynor, 45, died from his injuries, and the other two men were in serious condition at Broward General Medical Center, according to police. The survivors were not identified.
One of the assaults occurred near the Broward Center for Performing Arts and the other was near a church.
"It is a terrible thing that happened, and they will be punished accordingly," Detective Kathy Collins told the South Florida Sun-Sentinel. She said Gaynor's death will mean homicide charges.