Investigators were still processing evidence and trying to identify a motive for the attacks, Officer Joseph Silva, a police spokesperson, said Sunday.
California city rests easier after serial killings arrest
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In the fatal Stockton cases, none of the men was robbed or beaten before the killings - which all took place within a radius of a few square miles between July 8 and Sept. 27 - and none appeared to have known each other, Silva said.
Police: 6 California killings may be work of serial killer
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