The Alameda County Coroner's Bureau has identified the motorcyclist who died in a solo crash on Interstate 680 in Sunol last week as Michael Jankowsky, 59, of San Jose.
Jankowsky was riding northbound on I-680 near the truck scales just before Andrade Road when the motorcycle went down for unknown reasons just before 10 a.m. Sept. 26, according to Officer Tyler Hahn of the California Highway Patrol. No other vehicles were involved in the crash.
The San Jose man was transported to Eden Medical Center in Castro Valley, where he was pronounced dead later that morning.
Officers are unsure what caused the motorcycle to go down. They are investigating the possibility that Jankowsky suffered a medical emergency right before the crash, but they are awaiting final autopsy results from the coroner's bureau, Hahn said.