An Old Orchard Beach man accused of beating and stabbing his grandmother to death in the home they shared, then setting it on fire, has been indicted on murder and arson charges. Derek Poulin, who lived with his 61-year-old grandmother, Patricia Noel, has been in custody since his initial court appearance on Oct. 30. The Portland Press Herald, reports that according to documents, Noel described in letters and in conversations with relatives that the 23-year-old Poulin had been disrespectful toward her, called her names, and “gotten physical” with her. Authorities say Noel died from multiple blunt impact injuries to the head, skull fractures and multiple stab wounds. Police found a golf club handle and shaft, a golf club head, a wrench and a knife in the home.