A Whydunit How could he do that? Murder a brother, his sister-in-law, and his young niece and nephew as they slept in their beds? Jerry Mark was a Peace Corps volunteer, lawyer, 4-H leader, vice-president of his Cedar Falls High School senior class, and certainly a most likely-to-succeed young man when he graduated in 1960. Sixteen years later he was convicted of four cold-blooded execution-style murders of his own family. How could he? That s what Brother s Blood explores. Author Scott Cawelti knew Jerry Mark in high school, interviewed him in prison, observed his arrest, trial, and conviction with shock and horror. Brothers s Blood reveals a mind consumed with anger, revenge, jealousy, and greed. This book is not a whodunit but a whydunit. This account engages readers with the actual facts: the killer s cross-country motorcycle ride, the landmark investigation in which the murderer was fingered in ten days, the trial where circumstantial evidence was used to make a powerful case against him, and his appeals which continued for three decades.