43-year-old Alison MacKenzie vanishes while on vacation with her boyfriend in Belize. MacKenzie's boyfriend, Paige Rote, reported her missing after waking and realizing she was gone. Searches were conducted and multiple theories about her disappearance have surfaced. What happened to Alison MacKenzie?Joining Nancy Grace today:Darryl Cohen, Former Assistant District Attorney, Fulton County, Georgia, Defense Attorney Bruce Johnson - Owner of ISP Investigations-Master Sgt Region One Crime Scene Commander, Chicago Metro Area (Ret)Joseph Scott Morgan - Forensic Expert, Professor of Forensics, Author of "Blood Beneath My Feet"Dr. Bethany Marshall - Psychoanalyst, Beverly Hills Levi Page - Investigative reporter CrimeOnline