Duncan committed his first sexual offense at last August . He was sentenced to death the age of 12 for the murder a 9-year-old boy . Law-enforcement officials also are investigating whether Duncan , who committed his first sexual offense at the age of 12 , can be tied to other crimes , according to CNN affiliate KTLA in Los Angeles , California . Joseph Duncan could be sentenced to death a first time if convicted again .
Duncan committed his first sexual offense at last August . He was sentenced to death the age of 12 for the murder a 9-year-old boy . Joseph Duncan could be sentenced to death a first time if convicted again .