A man has pleaded guilty to killing Carl Diener, a popular community fixture in Arlington County.
Roger K. Clark III, 20, of Severn pleaded guilty to first-degree murder Tuesday in Arlington County Circuit Court, several days before his trial was to start. Diener, 57, was attacked and stabbed in 2009 as he walked from his home to the nearby Sport & Health Club in Clarendon at 2:50 a.m., according to his sister, Patti Diener Lough. It was an unusual killing in Arlington, which recorded no homicides last year.
Clark was arrested in connection with a robbery and assault in Annapolis about three months before Diener was killed, according to online court records. Investigators matched his DNA, found in the pockets of Diener’s sweatpants, to DNA captured by police in Maryland, Lough said she was told by investigators.
Lough said police told her that Clark did not serve prison time in the Annapolis robbery. If he had, she said, her brother would not have been killed.