He was 36 years old.
A Tennessee state spokesperson confirmed Jackson’s death to ESPN.
Jackson spent 10 seasons in the NFL with the Minnesota Vikings, Buffalo Bills and Seattle Seahawks. The Vikings’ second-round pick in 2006, he led the team to an 8-4 record as a starter in the 2007 season. He started a playoff game for the Vikings in 2008, losing 24 -16 against the Philadelphia Eagles in the Wild-Card round.
A native of Montgomery, Alberta, Jackson joined the Seahawks as a backup quarterback in 2011 and won a Super Bowl title with the team in 2013.
Jackson officially retired in 2018, three years after his last appearance in a game with the Seahawks, and became a coach.
In 2019, he joined the State of Tennessee as quarterback coach and attacking analyst.