SAN DIEGO — A 22-year-old pedestrian was injured in Torrey Pines Sunday night after she was run down by a bicyclist who did not stop. The woman was walking her dog east on Carmel Valley Road near Caminto Del Barco about 9:00 p.m. when she was struck from behind and knocked to the ground, San Diego police Detective Dan Wall said. The victim got up and went home but later went to a hospital where it was determined she suffered a double skull fracture, Wall said. Police were called to the hospital about 1 a.m., Wall said. The woman was unable to provide a description of the bicycle or its rider. Police originally said she was walking at 1:10 a.m.