After investigating a claim that Seattle Seahawks running back Derrick Fenner beat up a man, police said yesterday the complaint was unfounded and no charges will be filed.

A man who claimed Fenner hit and kicked him early Oct. 2 in a restaurant parking lot filed a police report but then refused to cooperate with detectives, police spokeswoman Tina Drain said.

Witnesses' statements indicated the alleged victim may have been the aggressor, she said.

"As far as we're concerned it's unfounded," Drain said. "There's no substance to the allegation that an assault was committed by Fenner."

The man did not file his complaint until 12 hours after the incident, Drain said. He asked police to withhold his name.

Detectives tried to contact the man at home, at work and by mail but he didn't respond.

Fenner (Oxon Hill High School) could not be reached for comment. . . .

Mike Lynn will leave the Minnesota Vikings to replace Tex Schramm as president of the World League of American Football, NFL Commissioner Paul Tagliabue announced.

Tagliabue said in a statement that Lynn, Vikings' executive vice president and general manager, was still working out the details of his departure. No date or reason for the change was announced.

But Schramm said he's no longer president because "it reached a point where my philosophy was different than that of the board of directors."

WLAF Chairman Dan Rooney said Schramm, the long-time general manager of the Dallas Cowboys, will stay on as a consultant.

The WLAF, scheduled to begin play next spring and affiliated with the NFL, will have teams in Europe and North America.

Schramm said Rooney called him with the news. Schramm said it "was a shock."