Brad made his name with Coleraine, which persuaded Blackburn Rovers to secure his services.
His first introduction to Scottish football came during a 2019 loan spell with St Mirren while he arrives at Rugby Park fresh from helping Morecambe to secure promotion to League One.
The Northern Irishman is a box-to-box midfielder who was known for finding the net during his time in the Irish League.
He played his part in Killie’s title winning season and now he’ll have a crack at the Scottish Premiership.