Fremont Mayor Bob Wasserman died Thursday at Kaiser Hospital, according to a city of Fremont press release.
Wasserman, 77, had been mayor since 2004, had served on the Fremont City Council since 1992 and had worked in law enforcement for nearly 40 years.
Fremont Vice Mayor Anu Natarajan said Wasserman served Fremont "with distinction and dedication," in the press release.
"On behalf of the City Council, I offer heartfelt condolences to the Wasserman family,” Natarajan said.
Natarajan will take on mayoral tasks until the council decides how to fill the vacancy, according to the press release.
In a report by The Argus, Councilman Bill Harrison said Wasserman was "part of that great generation that we're losing a bit of every day and it's sad."
"He was a mentor, a friend. He was more than just a colleague on the council," Harrison told the Argus.
Wasserman served Fremont long before his time on council. He was police chief from 1976 to 1991.
The Fremont Police Department also issued a statement expressing sadness on the mayor's death.
"Our heartfelt thoughts are with his friends and family today as we all mourn the loss and celebrate his life," the press release states.
Wasserman is survived by by his wife, Linda, and their two children, Dan and Jill.