A man accused of killing his mother in Chico and dumping her body in a septic tank has pleaded no contest to murder. The Chico ER reports Anthony Yee changed his plea Thursday. He'll be sentenced in May and faces life in prison without the possibility of parole. The victim was killed in December 2011. Prosecutors say Yee hit Judith Nathan in the head with a hammer, then dumped her body in a septic tank.