A Bronx woman was stabbed to death in her ex-husband’s apartment building last night, police sources said.

Luz Paulino, 33, was repeatedly knifed about 8:50 p.m. in the hallway of the seventh-floor Elmhurst building. She died at Elmurst Hospital.

Neighbor Francisco Beltre came home shortly after the gruesome crime and “saw blood everywhere, blotches of it everywhere.”

Cops have not located her former spouse yet, or a home address for the victim, sources said. Police believe she was living in the Bronx before the grisly killing.