Middleton has been a starter for most of his caeer, but injuries cut short his last two seasons. Last year, for example, he started the first seven games before being sidelined by a quadriceps injury.
Middleton is a 6-3, 330-pound guard and he will wear number 71 with the Dolphins. He played collegiately at Arizona.
As for Bellamy, he was with the Dolphins the past two years and appeared in two games. He had the only catch of his NFL career in last year's season finale at Baltimore.