Grice-Mullen has also been a member of the Chicago Bears, BC Lions, Miami Dolphins, Saskatchewan Roughriders, Hartford Colonials and Edmonton Eskimos.

He earned first team All-WAC honors and was part of the WAC's Special Award for Offensive Unit of the Year.

Grice-Mullen was signed as an undrafted free agent by the Houston Texans shortly after the 2008 NFL draft.

Grice-Mullen was signed to the practice squad of the BC Lions on September 9, 2008, and was later placed on the active roster.

[9] On August 16, 2011, Grice-Mullen signed with the Edmonton Eskimos after slotback Fred Stamps went down with an abdominal injury[10]