"I know I'm not an angel, but [Lawrence S. Yunkin], I never got mad enough to kill," [Lisa Michelle Lambert] writes in the document. "Your temper blew and you hurt her so bad she'll never get better."
Yunkin also testified that Lambert and another defendant, Tabatha Faith Buck, told him they agreed to slit Show's throat and "put her out of her misery" after an errant stab wound punctured one of Show's lungs.
Yunkin, who agreed to testify against Lambert in a plea bargain, denies being present at Show's slaying. He maintains he did not know of the girls' plans, but acknowledged he helped them with an alibi and to discard evidence.