NEW CITY, N.Y. (AP) _ The son of a United Nations executive has been convicted of murdering a Norwegian student after a homosexual sadomasochistic orgy in which a black leather bondage mask was placed over the victim's face.

The Rockland County jury took less than three hours Thursday to find Bernard LeGeros guilty of second-degree murder in the Feb. 23 fatal shooting of Eigil Dag Vesti, 26.

Vesti's mutilated and burnt corpse, the face covered with the mask, was found by hikers March 17 on the Stony Point estate owned by LeGeros' father, John.

Vesti, a student at the Fashion Institute of Technology, died of point- blank gunshot wounds to the head and neck.

LeGeros faces up to 25 years to life in prison when he is sentenced Oct. 17. Defense attorney Murray Sprung indicated there would not be an appeal

During the almost month-long trial, Sprung argued that his client was not criminally responsible for his actions because he suffered from schizophrenia.

Sprung tried to prove that the mental illness, rooted in a traumatic childhood, was made worse by LeGeros' cocaine abuse and his subservience to his former employer, Manhattan art dealer Andrew Crispo.

Prosecutor Kenneth Gribetz revealed a complex murder plot against another man allegedly planned by Crispo and LeGeros that went awry when the intended victim refused to cooperate on the fatal night.

Vesti was substituted, although it was unclear how, as testimony showed LeGeros met Vesti at Crispo's Manhattan apartment the night of the murder.

Crispo, 40, was implicated in the murder in confessions made by LeGeros after his arrest March 21, but he has not been charged.

The murder weapon, LeGeros' AR-7 .22-caliber rifle, was found in Crispo's gallery.

Crispo appeared briefly at the trial, but pleaded the right against self- incrimination and refused to answer questions.

Crispo and LeGeros face trial in Manhattan on charges that they kidnapped and sexually assaulted a homosexual student.