S1, E8: The 'detectives of death' are back to investigate another intriguing slate of bizarre criminal cases in this eighth installment in the popular documentary series that takes a riveting look at the world of forensic pathology through top autopsy experts. This edition explores six seemingly unsolvable cases that were cracked thanks to specialists including HBO's own forensic muse Dr. Michael Baden. Included in this special: a twisted case of sibling sabotage involving a serial rapist/killer in Toronto; a strange mystery where saliva turned a suicide investigation into a homicide conviction; the sordid story of a convicted rapist whose claims of innocence are taken seriously when his DNA turns up on a victim while he sits in jail; a bloody murder that is sniffed out by a canine Sherlock Holmes; the case of a medical examiner whose perfect murder was foiled a decade after the fact; and a "final answer" to the question, "Who was the Black Widow?"