The World Series of Fighting lightweight roster has grown with the addition of Keon Caldwell . MMAjunkie.com (www.mmajunkie.com) today confirmed the signing with Caldwell’s manager, Jason Ellis of Relentless Sport Management. Terms of the multi-fight deal weren’t disclosed, though the fighter, who’s previously competed as a welterweight, is expected to make his debut in late summer or early fall. Caldwell (9-1) had a brief appearance on “The Ultimate Fighter 13″ before leaving the show early for family reasons. Although it wasn’t shown on the reality show, Ellis said Caldwell was told his daughter was hospitalized and that doctors couldn’t break her fever. He opted to leave the show during the second episode to tend to his daughter, who ultimately recovered.  Inside the cage, Caldwell has won two straight fights since a submission loss to MFC vet Dhiego Lima in July 2010. He rebounded with knockout wins over Bryan Keller and Jonathan Baldree, which earned him a Southeastern Fighting Champions title, in his home state of Georgia. Caldwell, who hasn’t fought since July 2011, owns nine stoppages in nine career wins.