Demi Lovato's ex-fiancée, Max Ehrich, allegedly inhaled nitrous oxide and violently attacked his mom before he was arrested for domestic violence. According to the police report obtained by TMZ, law enforcement officers responded to a domestic violence call from someone who alleged the actor was showing himself harming his mom while live streaming. When cops arrived at the residence Ehrich, 34, shares with his mom, they reportedly discovered her at a neighbor's home.