A Manhattan man accused of stabbing his 80-year-old neighbor to death in the neighbor’s apartment told a 911 operator he had a “psychotic break” and “killed” him with a knife, according to prosecutors.

The district attorney’s office has charged Alon Riabichev, 45, with second-degree murder in the lethal stabbing of Lev Vayner, whom first responders found dead in his apartment on Overlook Terrace near West 184th Street in Washington Heights around 3:15 a.m. Monday. A judge ordered Riabichev held in jail Monday as he awaits his next court appearance, set for Friday.

A criminal complaint filed by the DA’s office says an NYPD officer responding to the scene discovered Vayner “covered in blood and laying unresponsive on the floor” of his home. Riabichev was sitting “further away” inside the a

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