Fennell was on Dublin's 2008 O'Byrne Cup winning team, which defeated Longford in the final.
[1] He helped guide Dublin to promotion to Division One of the National Football League.
He came on as a substitute in Dublins All-Ireland victory over rivals Kerry at Croke Park in September 2011.
[4] After the 2011 All-Ireland Senior Football Championship Final, a Dublin fan sneaked onto the pitch to celebrate.
He put on Fennell's discarded tracksuit top after joining the substitutes' bench and was seen on live television and in photographs.