Denver Police Sgt. Monica David-Vickery, the department's longest-serving officer, started her 47th year on the force. She'll retire in September, a few years ahead of her son, Cmdr. Mike O’Donnell.

The 78-year-old completed 46 years of service on Saturday and is the longest-serving Denver police officer on the force. She’s a sergeant now, and she’s finally wrapping it up in her 47th year ...