A Harlem thug bludgeoned his granny to death, then cavorted with a hooker in the dead woman’s bed — just feet from the closet where he’d stuffed her corpse, according to opening statements at the Manhattan trial of accused killer Larry Davis.

“This was a beating that’s old school,” prosecutor Matthew Bogdanos told the jury of the injuries found on Cora Davis, 76, when she was pulled from her closet three days after her death.

When Cora Davis’ son and nephew came to her Wagner Houses apartment, they found the grandson in her bed with a naked hooker, the prosecutor told jurors.

Davis dashed out of the apartment, but was arrested several weeks later.

litaliano@nypost.com