On January 10, 2004 in the divisional playoff game against the Tennessee Titans, he intercepted Steve McNair, which set up Antowain Smith's touchdown, as New England would hold on for a 17–14 win. In the AFC Championship Game the next week against the Indianapolis Colts, Harrison intercepted Peyton Manning in the end zone and forced a Marvin Harrison fumble, recovered by teammate Tyrone Poole. Harrison then went on to help the New England Patriots win their second title in three years, against the Carolina Panthers in Super Bowl XXXVIII, 32–29. He fractured his right arm late in the game, but a Tom Brady-led drive and Adam Vinatieri field goal secured the Patriots' victory. In his 10th year in the league, Harrison earned his first Super Bowl ring.