after all, michael shot sam not once but four times. one of the shots was to the back of sam's head. >> so sam is laying here and michael is right on top of him basically giving him the final shot. >> he would have had to have been. that's the evidence in the case. >> one shot is an accident. not the three or four shots he fired. >> but detectives wanted to know if this wasn't an accident, why then did michael shoot sam? >> got all of these pieces and tried to fit them all together. >> that's when michael revealed something that would turn the case on its head. he told detectives about an affair but it wasn't the affair between sam and diane. it was an affair he was having with the victim's wife. danielle. >> they had been having an affair for four years. >> it was a mind spinning moment. detectives had just discovered the victim sam had been cheating on his wife danielle.