share this The Howard County State’s Attorney’s Office has found that a Montgomery County deputy sheriff who fatally shot a man who attacked him with a large tree branch did nothing wrong. Sgt. Frank Pruitt of the Montgomery County Sheriff’s Office fatally shot Kevin Costlow, 52, of Laytonsville on Feb. 6. Costlow was seen driving erratically, then tried to attack multiple people, according to the sheriff’s office. Costlow was driving on Onley Laytonsville Road (Md. 108) when he almost crashed into one car, then front-ended another, Sheriff Darren Popkin said at the time. Costlow then used a large tree branch to attack people in the car he had hit, Popkin said.