Updated 9:24 a.m. Friday.
A 24-year-old Poway man was killed Thursday night after his motorcycle ran into the back of another vehicle, triggering a six-vehicle pileup on Interstate 15, officials said.
The motorcyclist has been identified as Daniel Shea of Poway.
Shea and another motorcyclist may have been racing on northbound I-15 near Ted Williams Parkway (State Route 56) around 10:15 p.m. when Shea ran into the back of a Suburban for an unknown reason, a California Highway Patrol spokesman said.
The Suburban had been in a far right lane of I-15 traveling about 60 mph, the spokesman said.
This began a six-vehicle pileup that also left one motorist with a minor injury, the spokesman said.
Shea was taken to Pomerado Hospital, where he died just after 11 p.m. "despite aggressive efforts," according to the San Diego County Medical Examiner's Office.
The crash remains under investigation.