Michael Politte was just 14 years old when he was charged in 1998 with murdering his mother, Rita Politte, who died after being hit in the head and set on fire in her Missouri home. More than three years after the crime, he was convicted and sentenced to life in prison for the murder, though he maintained he was innocent. He spent nearly 20 years in prison before a new law passed in Missouri that made him eligible for parole. Now 38 and out on parole, Michael Politte claims he knows who is responsible for killing his mother and talks with 48 HOURS correspondent Erin Moriarty.