Donnell was released by the Ravens on Friday, Jamison Hensley of ESPN.com reports.
Donnell was signed by Baltimore back at the end of July following a disappointing 2016 season with the Giants. His release shows that the Ravens, even with Crockett Gillmore's season-ending knee injury, feel as though they have enough depth at tight end with the likes of Nick Boyle, Ben Watson and Maxx Williams.