When he signed on for the Titanic, Walter Bull gave his age as 30, his birthplace as Hampshire and his address as 27, Chandos Street, Southampton. I suspect he was in truth a few years older than he admitted. He had one son (also called Walter), who after his death was granted a weekly allowance from the Titanic Relief Fund, but I've not seen any reference to support for a widow, so perhaps Walter was himself a widower or separated from the boy's mother.
Like many others among the crew, Walter had previously served on the Olympic. He worked as a scullion (basically a dishwasher) in the galley which served the 1st and 2nd Class passengers, and would have earned í‚£3 10s had the voyage been completed. On board he shared a dormitory cabin on E deck with 9 other scullions and 10 men who washed and polished the silverware. We don't know exactly what happened to him during the sinking - only that he died and his body was never recovered (or if so, it wasn't identified).