According to court documents, Bernard Charles Welch Jr., accused as the slayer of Dr. Michael Halberstam, has a long criminal record and created more than 10 aliases to cover his activities. At the time of the slaying, these records show, he was an escapee from prison. a

The records show that in New York State:

Welch was convicted of second-degree burglary in June 1971 and was sentenced to 10 years in prison.

Three months later, he was convicted of three counts of second-degree grand larceny and was sentenced to serve seven years on each count. (These and subsequent convictions came while he was serving the original sentence.)

In October 1971 he was sentenced to seven years after conviction of a third-degree burglary charge.

In November 1971 he was convicted of four counts of grand larceny and sentenced to five years for each charge.

In May 1972 he was convicted of three counts of third-degree burglary and sentenced to seven years for each count.

It was not clear which of these terms were to be served consecutively and which concurrently, but one prosecutor estimated that Welch should have served about 20 years for these crimes. Welch and a fellow inmate escaped on Sept. 2, 1974, from the Adirondack Correctional Treatment and Evaluation Center, a medium security facility.

The records show that a warrant is outstanding in that escape.

The records also disclose that Welch also was known as: Myron Henry Snow Jr., Bernard Miles, John William Landis, John Landis, Larry Lee Boone, Larry Boone, Jerry Lloyd, Norman Hamilton, Norman Heiman, and Hank Snow.