Baylor University player Patrick Dennehy was slain after he decided to expose improprieties in the school's basketball program, says a lawsuit filed here Friday by his biological father. Athletic department officials and university officials not associated directly with the athletic program would not listen to his concerns, the suit said. "Patrick determined it would be up to him to expose the improprieties ... to stop what was going on," said the state district court suit filed by Patrick Dennehy Sr., 44, of Seattle. "Shortly after making that decision, Patrick became the target of violent threats against his person and soon...