Police officer and LAPD Homicide detective. Renowned for his investigations of many of Los Angeles’s highest-profile murder cases, he served 43 years as a homicide detective beginning in 1949. One of his first assignments was the notorious Black Dahlia murder, a case he worked on-and-off until his retirement in 1993. His nickname, “Jigsaw John”, caught on because of his ability to piece clues together in difficult cases. Upon his retirement in 1993, St. John held the highest seniority on the LAPD with 51 years of service, a distinction that earned him the privilege of carrying LAPD Detective badge No. 1. The 1975 television series “Jigsaw John”, starring Jack Warden,  was inspired by the detective and the cases he worked.  (bio by: Louis M.)  Family links:  Spouse:  Helen St. John (1919 – 2002)* *Calculated relationship