| DeAngelo, 74, a former police officer, pleaded guilty to 13 counts of first-degree murder in a California courtroom Monday. He also admitted to rapes, kidnappings and other crimes that took place over a 10-year span from the mid-1970s to the mid-1980s. The arrest of DeAngelo in 2018 marked an extraordinary breakthrough, as it came decades after the hunt for the killer had grown cold, and because it relied on a groundbreaking genetic technique that has now helped solve dozens of other crimes. | 
