He played college football for the Miami Hurricanes and was selected in the second round of the 2006 NFL draft by the Washington Redskins.

[2] After the season, McIntosh was named to the South Carolina Shrine Bowl team.

[1] During his sophomore season, McIntosh was limited by a knee injury that slowed him throughout preseason practices.

[2] On January 1, 2004, he played in the 2004 Orange Bowl, where the Hurricanes won over the Florida State Seminoles.

McIntosh played in 12 games and made 23 tackles (16 solo), including one for a loss of three yards and one pass break up.

[1] In the season opener against Florida State University, he recorded 11 tackles, including a half sack and two quarterback pressures.

His shoulder injury returned and he did not play in the 2004 Peach Bowl, where the Hurricanes beat the Florida Gators.

For his efforts, he was voted honorable mention All-ACC and was selected as the Hurricanes Linebacker of the Year.

He recorded his first quarterback sack on Trent Green in a 16–13 overtime win against the Miami Dolphins on September 9, 2007.

[1] On December 16, 2007, McIntosh tore both the ACL and MCL ligaments in a 22–10 victory over the New York Giants after bending his knee awkwardly in a pile in the first quarter.

[1] McIntosh was recognized as the Redskins’ nominee for the NFL's Walter Payton Man of the Year Award.

On September 21, 2008, he made a season-high 12 tackles, one forced fumble and a half-sack in a win over the Arizona Cardinals.

He recorded seven tackles (two solo) and his first interception of the season (second of his career) in a loss against the Atlanta Falcons on November 8, 2009.

He started fifteen games during the 2010 season and recorded a new career high of 110 tackles as well as two sacks.

[15] McIntosh started eight games and recorded 65 combined tackles, one sack, and one pass breakup.

[21] Key In 2014, McIntosh became a football coach at Flint Hill High School in Oakton, Virginia.