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It's been nearly six months since mom of three, Melissa Trumpy has been seen. Her disappearance came shortly after she and her boyfriend at the time, 35-year-old Derek Hammer, were arrested at Trumpy’s home in Monticello, Wisconsin, for drug-related crimes.  Trumpy had reportedly agreed to cooperate with investigators and serve as a witness against Hammer.  Since Trumpy went missing, Hammer was arrested for alleged bail jumping.  Hammer served prison time in Nevada for battery by strangulation and possession of an explosive device, according to prison records. Authorities have not named Hammer as an investigative target in Trumpy’s disappearance. Joining Nancy Grace Today: Benny Affrunti - Father of two of victim's children, Change.org Petition: "**Missing Melissa Trumpy** Keep Derek Hammer In Jail" Mandy Mboge - Victim's Sister   James Shelnutt - 27 years Atlanta Metro Area Major Case Detective, Former S.W.A.T. officer, Attorney, The Shelnutt Law Firm, P.C., www.ShelnuttLawFirm.com, Twitter: @ShelnuttLawFirm  Dr. Shari Schwartz - Forensic Psychologist (specializing in Capital Mitigation and Victim Advocacy), www.panthermitigation.com, Twitter: https://twitter.com/TrialDoc, Author: "Criminal Behavior" and "Where Law and Psychology Intersect" (Miami Beach, FL)   Lisa M. Dadio - Former Police Lieutenant, New Haven Police Department, Senior Lecturer, Director of the "Center for Advanced Policing" at the University of New Haven's Forensic Science Department Stephanie Quirk - Multimedia Journalist/Reporter, WIFR 23 News (Rockford, IL)  Instagram/Twitter: @StephanieTQuirk See omnystudio.com/listener for privacy information.