In 1970, Sobel attempted suicide when he shot himself in the head with a small-caliber pistol. The bullet entered his left temple, passed behind his eyes, and exited out the other side of his head. This severed his optic nerves and left him blind. He entered a VA assisted living facility in Waukegan, Illinois. He resided there for his last seventeen years until his death due to malnutrition on 30 September 1987. No services were held for him after his death.