Driven by what prosecutors call a motiveless “compulsion to kill,” a California man voluntarily surrendered to a patrol officer — later directing police to a pair of hidden bodies in an investigation that authorities fear points to an unexposed serial killer.

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.

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