The Patriots are now one win away from reaching their fourth Super Bowl in six seasons after defeating the Chargers by a final score of 24-21.
San Diego's Pro Bowl kicker Nate Kaeding was short on a 54-yard field goal try with 3 seconds left.
With the Patriots trailing 21-13, Brady threw a 4-yard touchdown pass to the wide-open Caldwell with 4:36 to play. The Patriots tied it on a tricky 2-point conversion, snapping the ball directly to running back Kevin Faulk, who was standing next to Brady and ran through the middle of the line.
Marty Schottenheimer fell to 5-13 in the postseason, with Cleveland, Kansas City and San Diego.
Patriots One Win Away From Reaching 4th Super Bowl In Six Seasons