Having played for England Under-19s against West Indies in 1994/5, Killeen was the first Durham bowler to take five wickets in a National League game with figures of 5-26 against Northamptonshire in 1995.
He was on the verge of breaking into England’s one-day international set-up in 2000 but he tore ankle ligaments and was for a year.
Killeen also highlighted his talent in the 2004 Twenty20 Cup when he claimed four wickets in 12 balls against eventual champions Leicestershire Foxes.
In 2005 his wickets were crucial in helping secure promotion to Division One of the same competition, when he took 21 in the season, more than any of his team-mates.
Killeen enjoyed a benefit year in 2006.
He played just one match in Durham's 2007 LV County Championship campaign, but was ever-present in the one-day competitions, helping his team to the Friends Provident Trophy at Lord's.
Killeen was again a bit-part player in 2008, appearing just once in the championship which Durham won for the first time.
His career appeared to be winding down further in 2009 when he made no appearances in the longer format of the game, however he did appear on Sky TV as a pundit one more than one occasion.
As well as playing league cricket in the north east regularly, he also played cameo roles in the Friends Provident trophy where he took 5-48 on his only appearance.
He also took 11 wickets in the Twenty20 Cup .