Thurston Drew Shrader, a man of numerous identities who last month pleaded guilty to conceiling from police evidence of the alleged kidnaping and murder of a Mexican businessman, was sentenced yesterday to serve three years in prison.

Strader, 30, stood before U.S. District Court Judge Albert V. Bryan in Alexandria and said he had no statement to make on his own behalf. Bryan sentenced Shrader to serve the time at Lewisburg federal prison in Pennyslvania.

Shrader pleaded guilty June 27 to misprison of a felony, the formal charge for withholding evidence.

Prosecutors then dropped charges that Shrader kidnaped Raul Airport on legedly dismembered and dumped in the Chesapeake Bay although it has never been found.

U.S. prosecutors said Shrader had no advance knowledge of any impending kidnaping but only became involved after a crime had been committed.

Shrader has hidden behind four identities in the last four years. He was arrested in Newport News, Va., posing as T. Alexander Marbury, a histroy teacher and popular basketball coach at a Newport News high school.

In an interview with The Washington Post in May, Shrader said that his sister's boyfriend had been "ripped off" by Hernandez while he was living in Mexico.

The sister's boyfriend, Kenneth B. Krohn, a Harvard Ph. D., sought Shrader's help in luring Hernandez from Mexico to Dulles Airport, Shrader alleged, so that the businessman could be arrested by federal authorities.

Shrader said he never saw Hernandez and that Krohn told him Hernandez had been arrested in Dallas, Texas.

The following Tuesday, Shrader said, he went to the Krohn's apartment in Severan Park, Md., where he said Krohn showed him dismembered parts of Hernandez's body.

Shrader said he then helped Krohn dump what he believed to be Hernandez's body off the Chesapeake Bay Bridge.

Krohn has denied Shrader's allegations and said Shrader made up the story.