Special Agent Quincy Kjerstad suffered a fatal heart attack after completing a physical fitness training test at Jackson Park in Rapid City on September 11, 2026, around 8:30 a.m.
When Agent Kjerstad collapsed, emergency life-saving measures were performed, and he was transported to the hospital. He passed away three days later.
Agent Kjerstad had served with the South Dakota Division of Criminal Investigation for three years. Survivors include his wife and three daughters.
Source: ODMP
https://www.odmp.org/officer/27919-special-agent-quincy-r-kjerstad