Blackmon, 30, was set to earn $870,000 in 2015 as part of a $1.875 million contract and his release will clear $920,000 of cap space for next season.
He started in 12 games the last two seasons, and he played in the first eight games of last season before being put on injured reserve because of a broken finger. He had 30 tackles, one sack and one forced fumble in 2014.
Blackmon had 68 total tackles, two sacks, three forced fumbles, one interception and 10 pass breakups in his two seasons with the team.
- Scooby Axson