For the first time Dec. 7 we're getting to hear the last phone message that Stacy Peterson left on her father's voicemail just one day before disappearing under mysterious circumstances.
Now authorities are trying to fit this latest piece of evidence into the overall puzzle.
Here is ABC's Senior Law & Justice correspondent Kim Avila.
While Illinois State Police use dive teams to search the bottom of canals miles from Stacy Peterson's house, police served a 4th search warrant at the address where she lived with her husband until disappearing more than a month ago.
It outlines in new detail how police might build a circumstantial case against husband and former police sergeant Drew Peterson.
Searching Peterson 's SUV and Sedan for traces of any quote any blue plastic, lead weights, plastic shavings, plastic scuff marks, circular impressions or carpet indentations that would indicate the movement of a barrel like object or storage container.
This man, Peterson's stepbrother Tom Morphey, seen here in mug shots from domestic violence arrests in the mid-80's told a friend and reportedly authorities that he helped Drew carry what he thinks might have been Stacy' s dead body from the house in a blue container.
"He goes, 'I don't know what to do.' He put his hands on my shoulder and said, 'You can't tell anyone.' He had told me that he thinks he may have helped Drew dispose of the body," said Walter Martinek.
Peterson's attorney says the new warrant has convinced him that authorities are building a circumstantial murder case and may not wait to find a body before charging his client.
"The only case that they can build is a circumstantial case . But I think they have almost insurmountable hurdles in doing so. I don't think they'll be able to do it," stated Joel Brodsy, Drew Peterson's attorney.
Stacy Peterson has not been heard from since October 28th.
This voicemail was left for her father and posted on the family website, haunting evidence they believe that she was not planning on running away on her own.
"Hey dad! It's me, Stacy, I just wanted to call you and tell you I love you."
"The season's coming close and it's very difficult. We'd like to have answers before the holidays, that's just what we pray for," said Pamela Bosco, family spokesperson.
Stacy Peterson has been missing more than month.
Authorities say her husband remains a top suspect in her disappearance