In 2014, Heather Mack and her boyfriend killed Mack's mother while on a trip in Bali and were convicted overseas. Once back in the U.S., she was charged with conspiring to kill her mom. On Friday, Mack pleaded guilty. More: https://t.co/i4vk9DHPgR #Banfield pic.twitter.com/2BBXntmOuX — New...