The 30-year-old keeper started his senior career at Rugby Park, making 115 appearances and became a fansí favourite. During his first spell at Killie, Cammy also had loan spells at both Montrose and Queen of the South.
The six-foot stopper headed to Glasgow in the Summer of 2013 to join Rangers. After three seasons at Ibrox, Bell signed for Dundee United in June 2016 on a two-year contract. The Scotland international made 35 appearances at Tanndadice, before coming home to Rugby Park.
Manager, Lee McCulloch said: ''Cammy is an experienced goalkeeper, who is very familiar with the Club and the fans. He provides great competition for the other goalkeepers and I'm delighted to have him onboard.''