Klein threw for a career-high 281 yards and added 103 yards on the ground for the Wildcats (8-2, 5-2 Big 12), who rallied from a 10-point deficit in the final 6 minutes of regulation to hand the Aggies (5-5, 3-4) their third consecutive loss.
The Aggies had the ball first in the fourth overtime and moved down to the Kansas State 3 before their drive stalled. Facing fourth-and-1, coach Mike Sherman played it safe and kicked the field goal, and that gave Kansas State the opening it needed.
Klein pounded forward for three yards on third-and-3 at the 18 for a first down, and a pass interference call on the Aggies' Toney Hurd Jr. in the end zone gave Kansas State the ball at the 2.
Klein went straight up the middle twice, getting across the goal line on his second try as the crowd erupted, and the Wildcats poured off the sideline to celebrate the victory.