A woman was stabbed to death by her ex-husband inside her Bronx apartment early Wednesday, cops said. 

Flor Recio, 45, returned to her apartment on Noble Avenue near Mansion Street in Van Nest just before 4:30 a.m. when Exiquio Castillo, 47 – who was already inside – knifed her repeatedly in the torso, police said. 

Recio was taken to Jacobi Medical Center, where she was pronounced dead. 

Castillo fled before police arrived, cops said. 

But he turned himself in around 12:15 p.m. Thursday at the 43rd Precinct, to face charges of murder, manslaughter and criminal possession of a weapon, cops said. 

Two knives were recovered at the scene, police said.

Castillo has two prior arrests – one for criminal possession of controlled substances from 2002 and another for criminal possession of a weapon back in 1993, police said.