Nobody has heard from Virdell Green Jr. since April 30, when he spoke to his girlfriend over the phone.
The 46-year-old is a drummer who plays in several local bands.
San Jose police discovered Green's Jeep liberty parked outside of his ex-girlfriend's house a few hours after he last spoke to his current girlfriend.
"I think that there is foul play involved, I think that somebody knows something; a grown man does not just disappear like this," girlfriend Kim Harlan said.
San Jose police have released very few details about Green's disappearance.