He was waived under the category of "non-football illness."
The sixth-year lineman was scheduled to become a restricted free agent at the end of the 2014 season after signing a one-year deal with the organization at the start of this offseason. With Nwagbuo's release, the Bengals will have a cap savings of $645,000 this season.
Nwagbuo was a postseason addition last year after defensive tackle Devon Still was unable to play due to a back injury that flared up during a practice. While he was on the roster for the Bengals' wild-card round loss to San Diego, Nwagbuo was declared inactive for the game.
Before arriving in Cincinnati in January, the San Diego native had played for the Chargers, Panthers and Lions between 2009-12. The undrafted free agent began his career with San Diego, recording a career-high 19 tackles in 2009.
Nwagbuo's release comes as the Bengals are still trying to sign first-round draft pick Darqueze Dennard. He's the only draft pick the Bengals have yet to sign. Per the rookie wage scale that was set in the latest collective bargaining agreement, Dennard is slated to make nearly $8 million across his first four seasons.