The Minnesota Court of Appeals has affirmed a lower court ruling that Algene Vossen, age 80, isn’t competent to stand trial.

New DNA testing led to the arrest of Vossen in the death of 74-year-old Mable Herman of Willmar, who prosecutors said had been stabbed 38 times. Vossen was questioned shortly after the body of the victim was discovered by her sister. It was only after advances in DNA testing and another look at the case that Vossen was arrested decades later in Sioux Falls where he had been living.

Herman’s death isn’t the only one Vossen has been suspected of causing. The Willmar Police Department recently  provided information to Iowa authorities investigating to see if Vossen may have been involved in the murders of two Iowa women in 1976 and 1978.