June 25, 2014 7:02 pm Death Penalty Possible for Murder Suspect On Wednesday, 29-year-old Carlo Mercado pleaded not guilty to three counts murder in a case that started last Christmas Eve. NBC 7’s Bridget Naso reports. US & World Videos 4:10 ‘Christmas Card Lane' lights up for the holidays 2:26 San Diego International Airport braces for record holiday travel 2:28 Dry conditions linger for San Diego region 2:58 Prop 36 takes effect in California. What it means for retail theft, drug possession penalties in San Diego 2:35 Man accused in sledgehammer burglaries across San Diego County in court