Former major league pitcher Pascual Perez, who had a troubled 11-season career that included two suspensions for drug use, was killed at his home in the Dominican Republic in an apparent robbery, police said yesterday.

Perez, who last played in the majors for the New York Yankees in 1991, was found with a severe head wound in a town west of the capital, Santo Domingo, and there was evidence at the scene to suggest that whoever killed him had been searching for money, said Joel Valdemiro, a prosecutor who is involved in the investigation.

No one was in custody and authorities did not reveal whether they had any suspects. Police said there were several assailants and that the house in the town of San Gregrorio de Nigua appeared to have been ransacked. "It's an act of criminality, unfortunately," Valdemiro said.

Perez's brother Carlos, a former pitcher for the Dodgers, confirmed his death.

Perez's ex-wife Maritza Montero found his body about 8:30 A.M. Thursday and investigators said he appeared to have been slain about eight hours earlier. The precise cause of death has not been determined but officials said Perez, who had suffered severe kidney problems in recent years, had a fractured skull from a blow to the head.

Perez, 55, played 11 seasons in the majors and compiled a lifetime record of 67-68 with the Braves, Pirates, Expos and Yankees. But he was in and out of trouble for much of his career.

In 1982, Perez helped Atlanta win the National League West title with a 4-4 record. But in August of that season he missed a start because, as he later explained, he missed a highway exit sign and spent almost two hours circling Atlanta Stadium.

While playing for the Braves, he was suspended in April 1984 following his arrest in January of that year in the Dominican Republic on charges of cocaine possession. He spent two months in drug rehabilitation in 1989 while with the Expos, after failing to complete rehab programs twice before.

In March 1992, the baseball commissioner's office suspended him after a failed test the day he arrived for spring training with the Yankees. At the time, he was entering the final season of a three-year, $5.7 million contract. He never returned to major league baseball.