Career
He played in the Football League for Huddersfield Town. As a youngster, Killock was released from Huddersfield Town"s youth system. He joined Ossett Albion, where he played in the Northern Premier League as a 15-year-old schoolboy.
He rejoined Huddersfield"s Academy in early 2006, and in September 2007 received his first call-up to the first team squad for the Football League Trophy match against Grimsby Town.
He made an unexpected Football League debut in Town"s match at Gresty Road against Crewe Alexandra on 7 September, mainly because of injury to Nathan Clarke and Frank Sinclair and on-loan Richard Keogh"s absence on international duty with the Ireland under-21 team In January 2008, the contracts of Killock and fellow Town youngster Simon Eastwood were extended until 2009.
On 15 February, he joined Conference North side Hyde United on loan. He made his debut the next day in Hyde"s 2–1 defeat to A.F.C. Telford United.
He returned to the Galpharm Stadium at the end of the season.
Killock spent September 2008 on loan at Conference North side Harrogate Town. In January 2009, new manager Lee Clark sent Killock out on a month"s loan to Oxford United. At the end of the loan spell, Killock was released from his Huddersfield contract and signed a permanent deal with Oxford United until the end of the season.
Killock"s contract was then extended, despite his progress having been disrupted by injuries, then, at the start of the 2009-2010 season, he joined Conference North side A.F.C. Telford United on loan.
The move was made permanent in November 2009. He was released by the club in May 2012.
After his release from Telford he then signed for former club Harrogate.