Published: Aug 13, 2010 3:53 PM EDT
Updated: Aug 13, 2010 12:54 PM EDT

JACKSONVILLE, Fla. (AP) - A north Florida woman has pleaded guilty to manslaughter in the shooting death of a Jacksonville firefighter.

Fisthnise Saint Breux entered her plea Thursday.

Authorities say the 18-year-old was riding with 21-year-old Emanuel Porter II and two other people when they stopped at a gas station in December. When Porter got out the car, he reportedly pulled out a gun, removed the magazine and put the gun and the magazine on the front seat.

Police say Saint Breux picked up the gun, and Porter told her to put it down. Saint Breux pointed the gun at Porter's head and said she wasn't going to shoot him. The gun fired and hit Porter in the head, but Saint Breux later said she didn't remember pulling the trigger.

Saint Breux faces up to 30 years in prison when she is sentenced next month.