A 35-year-old man and a toddler are dead after a plunge from an Upper West Side building Sunday, the NYPD said.

Police responded to a call shortly after 12 p.m. of a jumper at 124 W. 60th Street, a 51-story apartment building. The man was found dead at the scene, while the boy, believed to be 3 or 4 years old, died while being taken to St. Luke's Roosevelt Hospital.

The man was found on the roof of 425 W. 59th St. and the boy was found nearby on the roof of a John Jay College of Criminal Justice building on the same block, according to a police spokeswoman.

Their identities have not yet been released as the investigation continues. It’s unclear whether the man fell or jumped to his death.

Residents on the block were horrified at the grisly deaths.

“I have a nearly 2-year-old and a 4-year-old myself, so this is heartbreaking,” said Sarah Noda, a 33-year-old photographer who lives down the block from the scene. “This is very scary, very sad.”