In Curse Of Strahd, the Pack visited the Church to deliver Burgomaster Kolyan Indirovich's body. They wanted to end Doru's suffering after hearing he had not been fed for a year, but eventually decided not to at the pleading of Donavich. He was left screaming under the floorboards in hunger and pain, further driving his father mad until the Slaying Of Strahd.
The son of Stefan Donavich, Doru was an idealistic follower of the Morninglord, tending to the Church of Barovia. His mother passed in childbirth, and he was raised solely by his priest father, lone tenets of the dilapidated and rarely-visited church. Despite his meekness, as a young man, he was swept up in a local effort to attack Castle Ravenloft, and was turned into a Vampire Spawn by Strahd von Zarovich. He returned to the village to terrorize it at Strahd's behest, but was lured into the Church's undercroft by his father, who locked him inside.
His screams from under the floorboards could be heard by everyone around the church, as he grew increasingly hungry for blood. The sounds and moral dilemma drove his father mad, but he refused to open the trapdoor.