CHICAGO (AP)—A circuit judge found a 50-year-old transient mentally unfit Wednesday to stand trial in the slaying of a Roman Catholic nun.

Cook County Judge Robert J. Collins ordered Karl Caldwell, charged with murder in the Oct. 14 beating death of Sister Miriam Friday, be held at the state Department of Mental Health facility in Elgin, said Lisa Howard, spokeswoman for the state’s attorney’s office.

Dr. Robert A. Reifman, director of the Cook County Psychiatric Institute testified that Caldwell, who has been in and out of mental institutions during the past 20 years, was a schizophrenic and unable to help his lawyers with his defense, Howard said.

Caldwell had been jailed since his arrest shortly after Friday’s death in the city’s crime-plagued Uptown neighborhood.

The Franciscan nun—a native of Stevens Point, Wis., who had been working with the poor and homeless in the North Side neighborhood for 10 years—had allowed Caldwell to stay in her apartment a few days before she was found slain in her bathtub, police said.