William died at Bishop's Waltham in Hampshire on 27 September 1404 and was buried in his chantry chapel on the south side of the nave in Winchester Cathedral. At the time of his death, he was one of the richest men in England. Much of his wealth went into the schools he patronised, but he also contrived to leave a fortune to a nephew, whose descendants include the Twisleton-Wykeham-Fiennes family and the Longe family.