Article content Cops closed cases that had haunted them for generations. We apologize, but this video has failed to load. Try refreshing your browser, or Cops turned up heat on cold cases in 2020 Back to video Much of the groundwork in these tough cases was done at the time minus the modern technology and tools that have sealed the deal for scores of killers. In Toronto, the sickening murder of nine-year-old Christine Jessop, who was slain on Oct. 3, 1984, was finally solved. Her remains were found months later on New Year’s Eve. She had been raped and murdered. Using DNA found in her underwear, cops named her one-time neighbour, Calvin Hoover, as the killer. He committed suicide several years ago.