Caler was a male Xahean who lived during the late 24th century. He was in a romantic relationship with Dahj Asha, and was killed by a gang of Romulan assassins in 2399. (PIC: "Remembrance")
Caler was played by David Carzell. His name was not mentioned in dialogue, but does appear onscreen as part of Dahj's contact list in her communicator. It also appears in closed-captioning.