A California man allegedly walked up to a cop and confessed to murder — then led investigators to the bodies of two men in what prosecutors now fear could be the beginning of a serial-killing spree.

Marcelino Castro, 28, approached a San Jose police patrol officer around 5:14 p.m. Saturday and allegedly said he had killed someone.

His confession set off a grisly search through the city’s Guadalupe River corridor, where detectives ultimately discovered two bodies at separate locations — and raised the chilling possibility that there could be more victims.

“Although there’s only two victims it looks like the start of a possible serial killer case…

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