American University's Gary Williams has turned down the head-coaching job at Duquesne, citing "personal reasons" for wanting to remain in Washington.

"Gary Williams has declined the offer from Duquesne," said Rick Vaughn, American's sports information director. Vaughn said the only explanation Williams offered was "just personal reasons. They made him a very lucrative offer but he just didn't feel it was the right situation for him."

Williams directed the Eagles to a 24-6 season and National Invitation Tournament bid. Duquesne is looking for a replacement for Mike Rice, fired after his team finished 11-16 this season . . .

The Widmer Cup panel of sportswriters and broadcasters has unanimously selected Georgetown as the East's best team this season. The Hoyas also won the cup in the 1979-80 season . . . Medical authorities say that heart disease caused the death of a 19-year-old basketball player at the University of Missouri-St. Louis. Ron Tyler, a sophomore forward, collapsed during a pickup game Wednesday at the school's field house . . . All-America Quintin Dailey of the University of San Francisco has been ordered to stand trial on four felony charges stemming from an alleged sexual attack on a female student Dec. 21.