Miller signed with the Cowboys after going undrafted two years ago and spent his rookie year on their practice squad.
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The 6-foot, 216-pounder signed a reserve/future contract in January with the Raiders.
Miller has no NFL statistics, appearing in four games for the Cowboys two seasons ago.
Update: The Ravens cut linebacker. D.J. Bryant, a Randallstown High graduate, from the practice squad and announced the addition of Miller.
The Ravens could use a linebacker on the active roster with Jameel McClain set to go on injured reserve with a spinal cord contusion, but have yet to make a roster move today.
They have two practice squad linebackers: inside linebacker Nigel Carr and outside linebacker Adrian Hamilton.
The Ravens could also activate middle linebacker Ray Lewis (right triceps surgery) from the injured reserve-designated to return list.