Kilmarnock manager Allan Johnston has made defender Mark Connolly his fourth signing of the summer.
The 22-year-old, capped by the Republic of Ireland at U21 level, has agreed a three-year deal and joins recent arrivals Paul Cairney, Jamie Hamill and Lee Miller at Rugby Park.
Connolly started out at Wolves and moved to Bolton for £1m in 2009 before loan spells at St Johnstone and Macclesfield. He spent the last two seasons with Crawley Town but was released at the end of 2013/14.