A father stabbed his 9-year-old son to death at a California park in a “twisted plan” to force police to kill him, authorities reported.

Mateusz Dzierbun, 48, of Fremont, called 911 at about 3:20 p.m. Sunday, July 13, to report a stabbing at Cataldi Park, the San Jose Police Department said in a July 14 news release.

“These officers had no idea that the frantic person on the line was in fact the suspect himself,” Police Chief Paul Joseph said at a news briefing, KTVU reported. “A deranged man who had murdered his own son.”

Officers arriving at the park found Dzierbun hunched over the child’s bleeding body with a kitchen knife in his hands, police said in the release.

He refused to drop the knife despite orders from officers, then stood, raised the knife and charged at them, police

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