Alpha Seven was the callsign of a Starfury pilot attached to Babylon 5.
In 2258, shortly after his thirtieth birthday, he was sent to investigate a disturbance in Sector 14, the location where Babylon 4 disappeared. A tachyon pulse from the time affected spot caused his internal organs to age three times past his natural age. He managed to set the auto pilot to return to Babylon 5, and scratched "B4" into his seat buckle before dying from "natural causes." [1]