Geraldo Lunas Campos, a 55-year-old Cuban immigrant, died on January 3 inside Camp East Montana, a sprawling detention facility built on the Fort Bliss army base outside El Paso, Texas. Six months later, his three adult children are suing four guards and the corporate chain behind the facility, seeking more than $1 million in damages for what they call fatal neglect of his mental health and a violent restraint that killed him.