Alston went on to play college football for the Stanford Cardinal. In 43 games with the Cardinal, Alston started 27 times. He finished his career with 164 tackles, 21 sacks and 29.5 stops for losses. He caused eight fumbles and recovered two others. Alston also had two interceptions, a pass breakup and a blocked kick for a touchdown. Alston redshirted in 2001 at Stanford, performing on the scout team as a middle linebacker. He began the 2002 season as a reserve outside linebacker, but ended up starting five finishing with 30 tackles and two sacks. In 2003, he totaled 21 tackles with three sacks and a forced fumble. In 2004, he produced 61 tackles from the strongside linebacker position, he also had 10.0 sacks forced three fumbles and 14.5 tackles for loss. Alston finished 2nd Team All-Pac-10 in 2004 and Third String All-American that year. He was honorable mention All-Pac-10 in 2005, as he registered 52 tackles with 6.5 sacks and 9.5 stops behind the line of scrimmage. He also caused three fumbles, intercepted a pass and blocked a kick. Alston finished his Stanford career in the top 10 in career sacks and single season sacks.
Professional career
Pre-draft
One of the most athletic linebackers in all of football, posting a 4.40 40-yd dash and 40" vertical leap at the 2006 NFL Combine. He also had a 11'00" broad jump. and bench-pressed 225 pounds 30 times. At the Stanford pro day, Alston ran a 4.40 40-yard dash.
St. Louis Rams
Alston was drafted in the third round of the 2006 NFL Draft by the St. Louis Rams. In 2006, he made 2 special teams tackles for the Rams. On September 1, 2007, he was released by the Rams.
Oakland Raiders
On September 3, 2007, Alston was signed to the Oakland Raiders' practice squad. He was then promoted to the active roster after Travis Taylor was released. He played in 13 games in the 2007 season for the Raiders, recording 8 tackles and 1 forced fumble. On March 27, 2008, Alston was re-signed as an exclusive rights free agent by the Raiders for the 2008 season. After linebacker Robert Thomas was waived/injured on September 2, Alston switched from No. 94 to Thomas' No. 55. Thomas was then re-signed by the Raiders weeks later. On October 19, 2008, in a game against the New York Jets, the Raiders were forced to punt on a 3 and out. However, longsnapper Jon Condo directly snapped the ball to Alston, who ran it for 22 yards on a fake punt play. In 2008, Alston led the Raiders in special teams tackles with 20 despite missing two games and starting 4 games at OLB. He ended the season with 34 total tackles and 1 pass defensed. Against the Chargers, Alston garnered a career-high of 11 total tackles including 9 on defense and 2 on special teams. Alston suffered a concussion and was placed on Injured Reserve on November 25, 2009.
Tampa Bay Buccaneers
On March 12, 2010, Alston signed with the Tampa Bay Buccaneers. Alston retired from the sport in 2011.
Post-football
Film career
Alston's first film, Red Butterfly was independently produced. Alston cites the works of Carl Jung and Joseph Campbell as influences on the film. Red Butterfly is a postmodern romantic tragedy in the style of Baz Luhrmann's Romeo and Juliet and Darren Aronofsky's Requiem for a Dream.
