Silas had been sitting with the aging Deacon and thought him to be getting better when he noticed that the man had in fact perished and William had not shown up to relieve him. He was then summoned to Lantern Yard.
William produces Silas' pocket knife and claims that it was found in the drawer near the bag of money that had belonged to the deacon and which had been emptied, thus implying that Silas had stolen the money. The bag was also found, empty, in Silas' apartment. After this he was suspended from the church membership and it wasn't long after until William had married Sarah and soon Silas ran off to live in Raveloe.