Legendary serial killer Richard Ramirez died in a California hospital yesterday — and the man known as the diabolical “Night Stalker” looked like the Jolly Green Giant in the end, sources exclusively told The Post.

Ramirez, 53, who was sentenced to death in 1989 after he was convicted of killing 13 people in a monstrous LA rampage, died of natural causes in Marin General Hospital.

A day earlier, the self-proclaimed Satanist was seen moving around in his hospital bed — with a shocking green hue to his skin, a knowledgable source said.

“He was the color green,” said the source. “He looked like a green highlighter pen. He was sitting up in his bed doing stretches.”

The disturbing image of the once-feared killer comes two weeks after Ramirez suffered another health scare at San Quentin State Prison.

He was rushed to the hospital, treated for his illness and returned to the prison.

During his 1980s murder spree, Ramirez shot, butchered and strangled his many victims while also raping some of them.