Ian Rapoport of the NFL Network reported the update Saturday.
"I definitely wanted to keep playing," he told Mike Kaye of NJ.com in July. "But I really wanted to make this work with the Eagles."
The University of Delaware product quickly found a new home with the Ravens, but an apparent change of heart has led him to hang up his cleats.
He recorded 413 total tackles, 11 passes defended, four sacks, three forced fumbles and two interceptions across 72 regular-season appearances. His 143 tackles in 2014 ranked fifth in the NFL.