*Police arrested man in fatal stabbing of Logan Circle runner

He was charged with first-degree murder in the killing of Wendy Martinez, 35, the chief of staff for a start-up Internet tech company, who was attacked shortly before 8 p.m. while running near her apartment.

Police described a brutal attack at P and 11th streets NW for which there is no explanation. Police said the petite marathon runner was stabbed six times in the head and neck, and once in the back. The attacker ran, police said, discarding a bloody knife and a distinctive mustard-colored shirt as Martinez stumbled into a Chinese carryout and bystanders tried in vain to save her life.