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SAN DIEGO — A young woman died after she stepped in to help victims of a multi-vehicle crash on state Route 94 in Grant Hill Thursday morning, according to California Highway Patrol.

CHP officers were dispatched to westbound SR-94 just east of the 28th Street off-ramp at 1:44 a.m. with reports of a crash involving a Honda Civic and Mercedes.

A driver who spotted the crash pulled over and two people got out of the vehicle to check on the motorists, CHP Officer Tommy Doerr said.

While they were checking on the crash, a woman was struck by a Jeep SUV traveling on eastbound SR-94, Doerr said. The impact sent the woman’s body flying and she landed on the westbound side of the freeway, Doerr said. The  woman died, Doerr said. Her name was not immediately released, but investigators said she was 19 years old.

Two occupants of the Mercedes sedan and the Jeep driver were transported to a hospital, Doerr said. The extent of the victims’ injuries was not immediately available.

It is unknown if drugs or alcohol were a factor.

This crash comes a week after an active-duty Navy service member was killed who pulled over to help what he thought was a stranded motorist.

“9-1-1 is the safest response for everyone if you want to help,” said CHP Sgt. Sofia Mosqudea said.