Police say a fight turned deadly Tuesday in Ronkonkoma.

Officials say 17-year-old Jonathan Estrada was stabbed in the chest behind the Lake Shore Commons Shopping Center around 7:30 p.m. They say he was trying to stop one of his friends from being assaulted.

Employees of the nearby Burger King called police after Estrada walked up to the drive-through window and collapsed. Estrada was taken to Stony Brook University Medical Center, but doctors weren't able to save him.

Estrada?s cousin said the teen just moved to the area from Florida a year ago to better his life. Police say Estrada was not in a gang, but some of the people involved in the fight might have been.

Police say they are still searching for the suspect. Anyone with information is asked to call Crime Stoppers at 1-800-220-TIPS or Suffolk County's Homicide Squad at 631-852-6392.