When Texas mother Heidi Broussard disappeared in December 2019, few would have guessed that her best friend Magen Fieramusca would be arrested a week later, accused of killing Heidi. Investigators say Fieramusca kidnapped both Heidi and her newborn daughter Margot in a plot to keep the infant as her own. The crime is now the focus of a new Lifetime movie called "Stolen Baby: The Murder of Heidi Broussard," starring Emily Osment and Anna Hopkins.