although patty and meredith had died in the evening around 8:00 p.m. , amber had been killed between 2:00 and 4:00 a.m. a bicycle enthusiast , oliver had ridden to work every day and sometimes did n't come home until well after dark , when he used a headlight to make his way back up the bike trail from downtown , where he 'd worked , to granite bay , where he 'd lived .