MINEOLA, N.Y. (AP) _ A former New York City police officer charged with murder killed a man on orders from his millionaire boss and may be linked to organized crime, authorities said Sunday.

Former officer Lawrence Masotti, 46, is charged with murder in the November death of Winthrop Frost, said Nassau County police Detective Sg. John Nolan.

Masotti killed Frost after developer Gerald Monter, 65, asked him to ''inflict a serious beating'' on Frost, Nolan said.

Nolan said additional arrests were expected in the case.

Frost, 48, was shot three times before he died in his apartment Nov. 6.

Monter hired Frost four months earlier as a construction supervisor, but Frost quit Nov. 4 over a dispute involving a concrete job, Nolan said.

On the day of the killing, Monter and Frost had a shouting match over money the developer allegedly owed him, Nolan said. Police believe Frost was killed within six hours of the argument.

Masotti and Monter were arrested Friday night, said Officer Frank Messana. Both were charged with second-degree murder.

On Sunday, Messana said police were investigating whether the suspects had ties with organized crime.

Police arrested Monter and Masotti after an anonymous tip led them to recover an unregistered handgun in a lake Thursday. Ballistics tests will determine whether it was used to kill Frost, Nolan said.

Monter told police his company has an estimated value of more than $100 million. Monter, who has no prior criminal record, has served on the board of directors for two Long Island hospitals.

Masotti worked as a city police officer from June 1963 until his 1978 retirement. He has served as Monter's chauffeur for the past three years.