CBS News correspondent DeMarco Morgan reports.
Warren police, the Federal Bureau of Investigation and other agencies spent Tuesday digging through dirt and vegetation at the site in Macomb Township for the remains of Kimberly King.
King was last seen in 1979.
A reopened cold case has led police to search for the bodies of several missing girls in a rural area north of Detroit. After his conviction, Ream led police to her remains in the same wooded area, about 30 miles (50 kilometers) northeast of Detroit.
Zarzycki went missing in 1986 and her body was later found in 2008 in the same area investigators are looking at today, Dwyer said.
Authorities resumed digging in a MI forest Wednesday for the remains of as many as seven girls who have been missing for decades. The work is expected to restart on Wednesday.
Crews arrived there Monday and began digging in earnest Tuesday for the remains of Kimberly King, a 12-year-old girl who was last seen in 1979 in Warren.
It is not clear if Ream has an attorney, but he faces no charges related to the missing girls.
It came after police interviewed a man serving life in prison for the slaying of a 13-year-old girl who disappeared in 1986 and whose remains were found in 2008 near the wooded area targeted for this week's search. Dwyer said they haven't yet uncovered remains, but they have found iitems that make them believe they are searching the right area.
"We do have, as you know, probable cause to believe this is a gravesite, no question about it", Dwyer said.
"It would mean a great deal to be able to bring her remains home", Beyma said.
King is one of many possible victims of a convicted child murderer, responsible for a number of heinous killings in the 1970s and 80s.
In another video, he tells investigators where he buried her body. He additionally drew a map of the positioning and spent about an hour on the search scene with authorities earlier than being returned to jail.
Included in that total is a female who went missing from the Oakland Mall in Novi, Michigan, and another who disappeared from Canton, Michigan, according to the police commissioner, who did not disclose their identities or the dates they went missing. He was already in prison for raping a 15-year-old girl when investigators got him to describe how and where he buried the girl two decades before. Dwyer did clarify, though, that Ream is not the suspected Oakland County Child killer, because he was in prison from 1974-1978.