The 18-year-old Northern California man charged with fatally stabbing a 9-year-old boy will not face the death penalty.

The Contra Costa district attorney's office included an allegation of lying in wait Tuesday when it charged William Schultz with killing the boy who was sleeping in his Discovery Bay, California, home. Prosecutors told the Contra Costa Times (http://tinyurl.com/ndn2ysk ) that Schultz's age and lack of criminal history are reasons not to pursue the death penalty.

Schultz told the newspaper in a jailhouse interview that he stabbed his best friend's younger brother Sunday morning to experience the feeling of killing someone before the world ended.

Schultz told the paper his parents have been concerned about his mental health.