McAfee, an ESPNU top 100 player, committed to Auburn after visiting the school over the weekend.
"I think they got a steal," Melrose coach Jermaine Johnson told the Commercial Appeal. "He likes their style of play. Coach (Tony) Barbee runs the triple-drive motion (offense) and Cedrick is an attacker."
McAfee's switch leaves FIU coach Isiah Thomas with three recruits from the class of 2011: forward Darnell Harris -- another top 100 talent -- and centers Chris Coleman and Yvan Ngirabakunzi.
The Golden Panthers, who open practice on Oct. 15, have seven seniors on roster, giving Thomas plenty of roster spots to fill.