Seattle is the first team to release a 2014 draft pick.
Scott was waived with a non-football illness designation a day after signing a contract.
"After undergoing an extensive physical with our medical staff last week, Garrett's examination revealed a rare heart condition that will prevent him from any on-field participation in the near future," said Executive VP and general manager John Schneider. "We think highly of Garrett as a person and as a football player. The team is committed to supporting Garrett in the months to come and will continue to help him determine his next steps."
Scott played in 41 games for Marshall University.
Scott was a second team All-Conference USA selection as a senior, after being a three-year starter at Marshall.
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