NEW : Having the police investigate is ` ` the right thing for the state , '' California governor says . Woman tells CNN she witnessed police beat man to death across the street from hospital . Sheriff 's office says that Silva ` ` three baton strikes '' after he fought with officers . Witness tells CNN , ` ` He only got to ask for help like old times ... Those hits were brutal ''
NEW : Having the FBI investigate is `` the right thing for the public , '' California sheriff says . Woman tells 911 she witnessed police beat man to death across the street from hospital . Sheriff 's office says David Silva `` received baton strikes '' after he struggled with officers . Witness tells CNN , `` He only got to ask for help like three times ... Those hits were brutal ''