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 …