A Vienna man has filed suit asking $3,052,500 for the death of his 20-year-old son, who died last March after his motorcycle collided with a Loudoun County sheriff's department car at the end of a high-speed chase.

The suit, filed in U.S. District Court in Alexandria, alleges that Billy F. Martin Jr. died because officers of the Leesburg police and the sheriff's department used "deadly force" to stop Martin, who attempted to outrun police in a 100 m.p.h. chase on his motorcycle on the night of March 30.

Martin was first noted by police in the town of Leesburg when he failed to come to a complete stop at a stop sign, according to court papers.

When police tried to stop him, Martin tried to outrun them, but ran into a sheriff's car being used as a roadblock on Rte. 7.

The suit also claims that Loudoun County Sheriff Robert W. Legard failed to thoroughly investigate the incident and discipline those responsible. f

Legard declined yesterday to comment on the case, saying that he had not yet been served with the court papers. Other defendants could not be reached for comment.