SAN FRANCISCO -- An 18-year-old San Carlos man was in custody Monday and expected to be charged with murder after a fight outside of AT&T Park over the weekend left another teen dead.

Police Sgt. Neville Gittens said Taylor Buckley turned himself into police on Saturday night after the 18-year-old Redwood City man died at San Francisco General Hospital earlier in the day.

Gittens said the dead teen fell and struck his head on the ground after being punched Friday night at a plaza adjacent to McCovey Cove that is not part of the ballpark.

A game between the San Francisco Giants and the Philadelphia Phillies was under way, but it was not yet known if the two, who did not know each other, had attended it before the altercation, according to Gittens.

Buckley was arrested just after the fight on suspicion of aggravated assault, but posted bail and was released, Gittens said. A murder warrant was put out for his arrest after the other teen died, he said.

A spokesman for the San Francisco Medical Examiner said Sunday that the victim's name is being withheld until his body is sent the city morgue pending the donation of his organs.

Giants spokeswoman Staci Slaughter said the team would work with police to prevent similar incidents in the future.

A 21-year-old Redwood City man was fatally stabbed outside the ballpark in 2004 after watching Barry Bonds hit his 700th career home run.