The airplane’s nose landing gear strut separated from the aircraft on the landing rollout at 1745 Eastern time. The airplan sustained substantial damage. Visual conditions prevailed; the solo private pilot reported no injuries.The pilot landed on the main gear and lowered the nose gear to the runway. The nose wheel started shimmying, then the nose pitched down. The pilot steered the airplane off the runway. The airplane nose landing gear yoke and strut had separated and were on the runway.