By CBS3 Staff

PHILADELPHIA (CBS) — Police say a man killed a suspect who carjacked his girlfriend outside of a North Philadelphia pizza shop on Thursday night. The couple’s three young children were inside the stolen vehicle.

It happened near 29th and Dauphin Streets.

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Police say the 25-year-old woman left her car running with three children inside when she went into the pizza shop, where her 25-year-old boyfriend works. That’s when the 54-year-old suspect got in the vehicle.

The couple was able to chase down the vehicle, which police say got stuck in traffic at 29th and York Streets. They pulled the suspect out, who then fled the scene on foot. Police say the boyfriend caught up with the suspect when he and other men from the neighborhood began to punch and kick the suspect.

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The suspect died from his injuries at Temple University Hospital. Authorities said the suspect suffered severe head trauma.

Police say the three children are 7 months old, 1 and 5.

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Police are continuing to investigate and are searching for the other men involved in the assault. Police say the assault was captured by a nearby surveillance camera.