David J. Cook (David J. Cook)

David J. Cook

Western Lawman and Detective. Began his career in the Rocky Mountain area tracking down Confederate Spies for the Colorado Cavalry during the Civil War. During the 1870’s he was a Denver City Marshall, Deputy U.S. Marshall, Arapahoe County Sheriff and General of the Colorado Militia. He started the Rocky Mountain Detective Association, the first formal network of law enforcement officers west of the Mississippi. This association operated throughout the western region, aiding lawmen for more than 35 years. He arrested more than 3,000 criminals during his career, with 50 of them being murderers. He was absolutely fearless, an expert horseman, a master marksman with both rifle and handgun and had few pears. He never struck without cause and never hesitated to kill when necessary. A true peace officer of the Old West.  (bio by: John “J-Cat” Griffith)  Family links:  Spouse:  Alice M. Grant Cook (1855 – 1922)*  Children:  Jennie Cook (1875 – 1893)* *Calculated relationship


  • August, 12, 1840
  • USA


  • April, 04, 1907
  • USA


  • Riverside Cemetery
  • Colorado
  • USA

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