Francesco Quinn
Francesco Quinn played Kabir Atef on JAG, before moving on to play Syed Ali, a terrorist on the second season of 24. He has done some voice acting as well, and even played in Quentin Tarantino movie, Hell Ride. Sadly, Quinn passed away in 2011.
Andrea Parker
Andrea Parker played Kate, or Lt. Caitlin Pike, during her run on JAG. Since then, she was Lydia Weston on Less Than Perfect, Jane Carlson on Desperate Housewives, and both Jessica DiLaurentis and Mary Drake on ABC’s Pretty Little Liars.