Giants cornerback D.J. Johnson doesn't necessarily believe the police version that friend and former teammate Kenny McKinley committed suicide this week. Johnson, a second-year backup who spent time with McKinley on the Broncos' practice squad last season, outlined a murky conspiracy theory on Friday when asked about McKinley's death. "Something fishy went down there," Johnson said without providing any details. "I don't think it happened the way they're saying it happened. Somebody did something to him." Johnson told The Post he thinks McKinley might have been murdered because of what he described as a dangerous climate for pro athletes in Denver.