After playing college football for Arizona State University, he was drafted by the Baltimore Ravens in the first round of the 2001 NFL Draft. Heap played ten years for the Ravens, becoming the franchise's all-time leader in touchdown catches and second all-time in receptions and yards. He was released in 2011 and played two years for the Arizona Cardinals. Following his retirement in 2013, Heap was inducted into the Baltimore Ravens Ring of Honor.

This Riddell Baltimore Ravens full size Pro Line helmet was signed in silver by Heap and includes a Great Moments COA.