ARLINGTON, Va. (WUSA9) -- The man who stabbed and killed Carl Diener in 2009 has been sentenced to 27 years in prison.
Authorities say Javon Martin helped his cousin, Roger Clark III, rob Diener in Clarendon. Diener was walking to a gym in the Clarendon area in December 2009. Authorities say Martin and Clark had lost money while gambling that night and when they saw Diener, who was 57 years old, they decided to drive up and try to rob him.
Clark got out of the car and tried to take Diener's gym bag but Diener fought back. Seeing that his cousin was having trouble, Martin got out of the car and stabbed Diener. Martin grabbed Diener's bag whle Clark went through Diener's pockets, according to authorities. The bag contained $50.
It wasn't until June 2011 that authorities made an arrest in the case. When Clark went through Diener's pockets, he left DNA evidence behind. Investigators were able to link his DNA from an earlier robbery and assault in Annapolis to the DNA evidence from Diener's murder.
Clark pleaded guilty in 2012 to first degree murder, and testified against Martin in order to get a reduced sentence.