A body found in a cardboard box along Interstate 70 in Frederick County, Md., was that of man reported missing four days earlier, D.C. police said.
Police are looking for a Hyattsville, Md., man in connection with the death.
The body is that of 36-year-old Jacobo Vazquez, who was reported missing Friday and found near Frederick on Tuesday, the Metropolitan Police Department said. The Maryland Medical Examiner's Office said Vazquez was shot to death.
Police said they have issued an arrest warrant for 34-year-old Marvin Palencia, of Hyattsville. They said he drives a 2007 light green or grey Honda minivan with Maryland tags spelling out an approximation of his last name -- PALNCIA. He is considered armed and dangerous.