The Dolphins have released running back Mark Walton after the team was made aware of a "police matter" on Tuesday morning, general manager Chris Grier said in a statement.
"We hold our players to a high standard and take these matters very seriously. We will have no further comment at this time," Grier said.
No further details on the police matter have been reported at this time.
Walton was nearing the end of the four-game suspension he received from the NFL for violating its conduct and substance abuse policy. The suspension was related to his three offseason arrests between January and March.