Zack and Spring's 6-year-old son, Mason, was murdered in 2014 by his grandmother. Spring says her mother-in-law, Martha, lured her grandson into the bathroom two days before his seventh birthday, telling him she had a surprise and then stabbed him to death. Zack and Spring claim their son's murder was premeditated. After Mason's death, Spring says Zack wanted a separation, started abusing drugs again and acting erratically. Find out what Spring says Zack did one night that scared his 13-year-old son so severely that he called the police on his father.

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