They say Darius Bunyad vanished in the middle of a sex crime trial last month. They released photos of the 36-year-old chiropractor, showing four different looks.
Police say he failed to show up for the last two days of his trial.
He was found guilty of six felonies and six misdemeanor charges and now there's a warrant out for his arrest.
Police say Bunyad was last seen by a family member in Walnut Creek on March 8.