Carl Diener was an early riser and a health nut. He regularly walked to his jobs opening two Arlington County gyms long before sunrise. Friends were shocked to learn that Diener, a retired government worker, was fatally stabbed last week, apparently on one of those walks.
Police were trying to figure out who killed Diener and why. It was one of two killings in the county last year.
Officers were "following everything that seems like it's a lead," said Detective Crystal Nosal, an Arlington police spokeswoman.
Diener, 57, was found at 2:50 a.m. Dec. 29. He had been beaten and stabbed and was lying on the street in the 3200 block of North 13th Street in Clarendon. Officials would not say whether his gym bag and wallet were with him.
Friends at the Arlington Sport & Health Club said Diener was a gregarious man who knew everyone by name and reveled in telling amusing stories.