The crash occurred when Geordan Dunkle, 24, lost control of a 1999 Saturn sedan on Wildcat Canyon Road in the Lakeside area shortly before 5 a.m. Sunday, according to the county Medical Examiner's Office and California Highway Patrol.
The northbound car veered across a set of solid double yellow lane markers, crashed into an oncoming 2000 Toyota Camry just north of Blue Sky Ranch Road and overturned, CHP Officer Berek Downing said. Dunkle and his 26- year-old brother, Gregory, died at the scene.
A 25-year-old Chula Vista man riding in the back of the Saturn suffered severe injuries in the head-on wreck, as did the 42-year-old El Cajon man behind the wheel of the Camry. The surviving driver's 53-year-old male passenger, also an El Cajon resident, was left with moderately serious trauma.
Authorities found an open beer bottle and several medical-marijuana containers in the Saturn, Downing said. A determination on whether Geordan Dunkle was under the influence of alcohol or cannabis at the time of the crash remains on hold pending completion of postmortem toxicology tests.