“48 Hours” investigates a woman who tried to kill her lookalike with poisoned cheesecake

Authorities say a woman named Viktoria Nasyrova tried to kill her lookalike and steal her identity in a most unusual way. Nasyrova is accused of poisoning a beauty stylist, Olga Tsvyk, with a piece of cheesecake. 48 Hours correspondent Peter Van Sant joins “CBS Mornings” with a preview.