The man may have suffered from a serious mental disorder when the murder was committed, local media reports.
In mid-June, an elderly man was found dead. He had been stabbed several times.
The man now indicted was arrested after he knocked on the door of a neighbor of the murder victim with bloody hands and told him what had happened.
During the summer, the suspect underwent a so-called Section 7 examination, which showed that he may have suffered from a serious mental disorder.
It is unclear if the man charged had any connection to the victim.