SALT LAKE CITY — Utah authorities are reviving a 1998 cold case they say might be connected to a convicted Colorado serial killer.

Investigators said Tuesday that circumstantial evidence points to Scott Kimball.

State Bureau of Investigation agent Brian Davis said that includes a complicated rope knot like one used on a Kimball victim and a child’s play rug matching one his son had at the time.

Davis said they’re also still trying to identify the woman whose body was found in southeastern Utah near Lake Powell. DNA indicates Native American or Hispanic descent.

Kimball was convicted of the slayings of four people killed after he was released from a Colorado prison to become a paid FBI informant.

He has previously denied in involvement in other cold-case killings.