Miguel Mallorca, a Pacifica resident, was riding a 2005 Kawasaki Ninja motorcycle around 7 p.m. on the Sullivan Avenue on-ramp to southbound Highway 1 near the interchange with Interstate Highway 280, according to the CHP.
For an unknown reason, the motorcycle turned to the left and went off the roadway and then became airborne, landing on Highway 1 below, CHP officials said.
Mallorca was ejected from the motorcycle, which became engulfed in flames. Mallorca was taken to San Francisco General Hospital, where he succumbed to his injuries, according to the CHP.
The cause of the crash remains under investigation by the CHP.