Sixty-five-year-old Timothy Krajcir (KRY'-chur) was moved this week from Kentucky's McCracken County to a maximum-security prison in Pontiac.
Krajcir pleaded guilty last month in Kentucky to burglary and kidnapping charges related to the 1970 death of 29-year-old Joyce Tharp of Paducah.
He already has received life sentences for five killings in southeast Missouri and two killings in southern Illinois, most of them taking place in the late 1970s or early 1980s.
He's been in prison since 1983 for other sex crimes. Krajcir confessed to the killings after receiving assurances he wouldn't face the death penalty.