Osvaldo Rivera, 31, is accused of slitting the throats of 6-year-old Dominick Andujor and his 12-year-old sister Amber in their home early Sunday, ABC News reported.
Dominick was dead at the scene and Amber was listed in critical condition after she ran, bleeding, to a neighbor’s home for help.
She shouted “Popeye did it!” though authorities initially thought she said “Papi.”
Rivera was arrested Sunday and charged Monday with murder and attempted murder.
Cops found him cowering behind a mattress in an apartment a few miles from the Andujor home, though he reportedly lives just down the block
His bloody sneakers matched footprints from the house, the Camden County Prosecutor's Office said.
Relatives of the victims claimed Rivera also sexually assaulted Amber, though he has not been charged for it.
Cops in Camden investigate outside the home where two kids' throats were slashed.
Rivera is set to be arraigned Tuesday. He told cops he had smoked marijuana mixed with PCP, sometimes called “wet,” just before the attack.
The combination can cause aggression and intense hallucinations, and was implicated in a Camden mom cutting off the head of her 2-year-old son and then fatally stabbing herself just two weeks ago.