Brent was involved in a car wreck in December in which practice squad linebacker Jerry Brown was killed. Brent's blood alcohol level was 0.18, more than twice the legal limit in Texas.
"This is the right decision for me, and something that I have given a lot of thought to. I am at a point where my main focus is all about getting the priorities in my life in order," Brent said in a statement.
Read the rest of the story here.