One practitioner's perceived good deed for a dying patient could be another's definition of homicide. In No Good Deed: A Story of Medicine, Murder, Accusations, and the Debate over How We Die (HarperCollins), Lewis M. Cohen, MD, examines the true story of two renal nurses at Baystate Medical Center (Springfield, Mass.) who were investigated for murder in 2001 after a nursing assistant accused them of causing the death of a patient.