Mulligan was re-signed by the Lions on Tuesday, Kyle Meinke of MLive.com reports.
Mulligan was surprisingly cut by the Lions right before the beginning of the regular season but was brought back after Cole Wick (knee) was placed on injured reserve Tuesday. At this point, he will likely serve as a reserve tight end, currently sitting behind the likes of Eric Ebron, Khari Lee, and Clay Harbor on the depth chart.