The Dolphins signed former Arizona Cardinals WR Michael Rios to a one-year contract, bolstering their crop of backups at that position. Rios, undrafted out of Marist College, is a local product having attended Miami Belen High School. When he signed a free agent contract with the Cardinals in 2012 he became the first player from Marist to sign with a NFL team. Rios didn't compile any statistics with Arizona last season. He was released in late July after sustaining a broken left foot.