Michael Irvin, former Cowboys wide receiver and ESPN analyst, is facing accusations he assaulted a disabled contractor who was hired to install a fountain at his Plano home. Shawn Vandergrift filed a lawsuit Monday against Mr. Irvin in Denton County, claiming that the former player yelled at him and grabbed him during a December dispute over a final payment for the construction work. The suit claims that Mr. Vandergrift is permanently disabled by a hip condition and that he required medical attention as a result of being grabbed on the left arm during the confrontation. Irvin could not be reached for comment Monday night.