The Washoe County District Attorney’s Office announced that a second man has been sentenced to 20 years in prison for his role in a September, 2015 armed robbery. 29 year old Christopher Mateo will serve a minimum of 8 years before becoming eligible for parole. A co-defendant, Adam Lavelle Johnson, was sentenced earlier this year to 15 years in prison, with parole eligibility beginning after 4 ½ years. Both defendants pleaded guilty to the charges. Mateo is an ex-felon in possession of a gun, which added enhancements to the sentence.