The following is an article from WWE.com:

What should have been the night Eddie Guerrero has dreamed about since the first time he stepped into the ring turned into his worst nightmare on SmackDown! last week as somebody he considered a trusted friend stabbed Guerrero in the back. Serving as referee for the match between Eddie and Chavo Guerrero, Kurt Angle not only refused to count when Eddie seemed to have the match won, but he then unleashed a vicious assault on Guerrero