Clarence Carnes, the only inmate survivor of a 1946 escape attempt from Alcatraz that left seven dead, died Monday in prison a month before he was to be released. He was 61.

On July 6, 1945, Carnes was sent to Alcatraz, the federal prison island in San Francisco Bay. He was 18, the youngest inmate ever incarcerated there.Early the next year, Carnes was drawn into a daring escape plot that quickly went awry. Two guards were killed and several were wounded. The six inmates who participated got control of little more than one cell house.

When it was over, three inmates were dead. Two others, Miran Edgar Thompson and Sam Shockley, were later executed. Carnes was spared the death penalty because he refused to slay several guards he was assigned to kill.