At its commencement ceremony on May 13, Florida Memorial University will present a posthumous honorary degree to Trayvon Martin, the Florida teenager killed by George Zimmerman five years ago.The private university announced Wednesday that Martin's parents, Sabrina Fulton and Tracy Martin, will accept a bachelor of science degree in aeronautical science with a concentration in flight education on behalf of their son. The degree is in "honor of the steps he took during his young life toward becoming a pilot," the school said in a Facebook post. Florida Memorial's Department of Aviation and Safety has a designated Cessna pilot training center, and the school also houses the Trayvon Martin Foundation. It is based in Miami Gardens, where Trayvon Martin lived with his father.Trayvon Martin was 17 when he was shot and killed in February 2012. Zimmerman was a neighborhood watch captain in Sanford. He had called 911 to report a suspicious person in his neighborhood and later got into a fight with Martin.Zimmerman said he shot the teenager in self defense. The shooting sparked protests nationwide for months. Zimmerman was acquitted of the crime in July 2013.