A 53-year-old man was killed by a stray bullet at a Brooklyn handball court on Sunday, police said.

The innocent bystander was found shot to the head inside Lincoln Terrace Park off Eastern Parkway in Crown Heights at about 5:45 p.m. cops said.

The man was pronounced dead on scene. He was not immediately identified by authorities.

Investigators believe the victim was caught in the crossfire of two nearby groups in the park, police said.

It’s unclear what sparked the beef between the two sides.

No arrests were made as of late Sunday.