The Dolphins also released running back Jonas Gray, whom they claimed last week after Gray was cut by the New England Patriots. Gray was briefly moved up to Miami's 53-man roster over the weekend but didn't play Sunday against Washington.
James, a second-round pick of the San Francisco 49ers in 2012, won the kick return and punt return duties for the Dolphins in training camp. But James fumbled a kickoff Sunday in the third quarter against the Washington Redskins that he eventually recovered. In addition, James fumbled and lost a punt in the preseason finale against the Tampa Bay Buccaneers.
FoxSports.com also reported that James and teammate Jarvis Landry had a brief scuffle last week during preparation for the game against Washington. Both players quickly apologized, according to the report.
The Dolphins also promoted tight end Jake Stoneburner to the 53-man roster Monday. Miami needs depth at that position after backup tight end Dion Sims suffered a concussion Sunday against the Redskins.