Sheriff Robert Carmon was shot down by Quantrell's Bushwhackers, at Keytesville.

Sheriff Carmon was killed in a Confederate raid by a band of Quantrill's Raiders under the command of Major Thrailkill and George Todd during the Civil War. A band of 250 of Quantrill's Raiders plundered the town of Keytesville, Missouri as a part of General Price's 1864 campaign through Missouri, pressing from eastern Missouri to the Kansas City area along the Missouri river. Thrailkill's force arrived at Keytesville which was defended by a small Union detachment of 35 men. Under a white flag Major Thrailkill demanded the surrender of the Union detachment under a promise of fair treatment. Thrailkill's troops then paroled the detachment, a European practice utilized as for want of facilities to handle large numbers of prisoners. The defending troops were released on the promise of no longer participating as a combatant until his name was exchanged for a paroled Confederate troop. Thrailkill's force then burned the courthouse with all of it's records and killed two citizens, Sheriff Carmon and a noted Union scout, William Young.

Sheriff Carmon had been a resident of Keytesville for more than ten years. He was survived by his wife, Anna, and five children. Interred: Keytesville City Cemetery.