The team released defensive end Dion Jordan Friday, almost four years after they selected him with the third overall pick in the 2013 NFL Draft.
One of the biggest draft busts in Miami Dolphins history is now an ex-Dolphin.
Now, with only one career start under his belt, the Dolphins have released their former prized draft pick.
In an email to ESPN after the suspension was announced, his agent, Andrew Kessler, wrote: "It is very unfortunate that T.J. will miss the first eight games this season, but he and I are both looking forward to him returning to regular-season action when eligible". He was suspended for the entire 2015 campaign after violating the league's substance abuse policy.
McDonald was part of a Rams defense that had the 16th-ranked run defense last season, and he could help improve Miami's 30th-ranked run defense from a year ago.
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McDonald was arrested last May in Los Angeles on suspicion of driving under the influence. It remains to be seen if another team will take a chance on the former college standout.
"I'm definitely paying the price for the mistakes that I've made, that I'm definitely going to own up to", McDonald said Friday.
"The one thing I can do is earn the respect for my work - through camp and OTAs - of my teammates and the coaches and provide a spark when I can".
"I just got to be hungry, stay clean and be open and honest about everything, and make sure that this doesn't happen in the future", he said. "Week 9, I'll be chomping at the bit".