SHARE 15 8 COMMENTMORE

(WBIR-Knoxville) There are several hundred pages in confessed serial killer Jerry Marcus' case at the Knox County Sheriff's Office, and investigators say more pages could soon come.

"We need the public's help in identifying any black females who disappeared between the years of 1975 to 1984," KCSO investigator Amy Dobbs said Thursday.

Marcus, currently in a Mississippi prison for a 1987 murder, has confessed to killing six more people in three states, including Tennessee.

In 1984, Francine Davis, 30, was found dead in Knoxville. Marcus told authorities recently he killed the woman. The question now-- is he tied to any other cold cases in East Tennessee?

"Are there truly others, and if so, are there any of the city and the county combined cold cases we have down there?" Dobbs added.

KCSO is specifically seeking information on any black women missing between 1975 and 1984. If you have any information that could help, they're asking you to call the sheriff's office at (865) 215-2243.