Answer the following question: Given the following context:  On Christmas Eve 1950, a man named Wilfred Butler, engulfed in flames, runs out of his mansion near the small town of East Willard, Massachusetts. His death is ruled accidental, and the house left to his grandson Jeffrey. Twenty years later in present day 1970, lawyer John Carter arrives in East Willard on Christmas Eve with his assistant and mistress Ingrid, having been charged by Jeffrey Butler to sell the house. Carter meets with the town's leading citizens: Mayor Adams; Sheriff Bill Mason; the taciturn Charlie Towman, who owns the local newspaper; and Tess Howard, who operates the town's telephone switchboard. They all agree to buy the Butler mansion on behalf of the town for the bargain price of $50,000, which Jeffrey Butler requires to be paid in cash the next day. Carter and Ingrid stay the night at the Butler mansion, unaware that they are being watched by an unseen man who has just escaped from a local mental hospital and just arrived in East Willard in a stolen car. After dinner, Carter and Ingrid retreat to a bedroom to have sex. Their unknown stalker enters the bedroom and brutally murders them both with an ax, and then reads from a Bible before placing a crucifix in Ingrid's hand. The killer calls the sheriff, asking him to come investigate Carter's disappearance, and introduces himself as the house's owner. While talking with Tess, who forwards his call, he calls himself "Marianne". At nightfall, Jeffrey Butler arrives at the mansion to meet with Carter, but finds it locked and empty. He drives to the mayor's home, where he meets Diane, the mayor's daughter. The mayor has gone to the county's bank to obtain the required cash for the payment, so she redirects Jeffrey to the sheriff's office. At the same time, the sheriff is heading to the mansion, but stops at Wilfred Butler's disturbed gravesite, where he finds Butler's diary, then he's attacked and bludgeoned to death with a shovel by the same homicidal madman.  answer the following question:  What is the full name of the person who is murdered when checking on the disturbed grave?
Answer:
Bill Mason