Alfonzo entered the AFL in 2001 with the Indiana Firebirds but spend the whole season on injured reserve.
Alfonzo began his Rush career as a defensive specialist, but rotated also as a WR/DB until becoming the teams WR/LB in late 2006.
[2] With the new free substitution rule added to the game in 2007, Alfonzo was regulated mainly as the team's jack linebacker, but still remained active as an Ironman, lining up as a receiver or fullback at times.
After the AFL suspended operations for the 2009 season, Alfonzo signed with the Chicago Slaughter of the Continental Indoor Football League on February 11.
Along with many other Chicago Rush players, the Slaughter finished the season undefeated at 14-0 and won the CIFL championship.