Newly released video shows an Ohio man confessing to murdering four people during a cocaine binge and telling police that two people knew of the killings before the last one.

Forty-one-year-old Donald Hoffman pleaded guilty and is serving life in prison for the slayings that stunned the small city of Bucyrus (byoo-SY'-rus) last fall.

Police and the Crawford County prosecutor say Hoffman was the only person charged because other people didn't participate in the killings and there was no corroborated evidence that they had knowledge that would have prevented a death.

Hoffman himself told police he wasn't sure the acquaintances believed him when he admitted killing people.

Video of his police interviews was released Friday. It offers some explanation for the slayings, mostly a combination of drugs, money and anger.