Jack McCullough awoke a few months into his life sentence for the 1957 slaying of an Illinois schoolgirl as his cellmate plunged a shank fashioned from a toothbrush into his face, eventually dislodging his eye.Multiple inmates had vowed to kill him to avenge Maria Ridulph, he said in phone interviews Sunday and Monday, and his bunkmate was seeking to make good on that pledge. Court records show his cellmate was convicted in the attack, in which McCullough said surgeons at a Chicago hospital were able to save his eye …