Keith Cooper Jr. Released by Miami Dolphins on Thursday

The Miami Dolphins released defensive lineman Keith Cooper Jr. on Thursday as part of roster adjustments made by rookie general manager Jon-Eric Sullivan. To fill the open spot on the practice squad, the Dolphins signed EDGE Amari Gainer, who previously spent time with the organization last month. Cooper's release comes as Miami prepares to host the Cincinnati Bengals for their upcoming Sunday matchup at Hard Rock Stadium.