. >> until jeremy costello spots someone driving erratically. >> what caught my attention is how shehought she would hit a pedestrian, without a doubt, and remember throwing my arms up going "oh crap." next thing he knew, he was in a high speed chase. >> she was trying to flee from me in a stolen motor vehicle. so i proceeded to give chase with lights and sirens on. joining the hunt was police officer jim lee. >> she runs up into the sidewalk, she hit a rock or retaining wall there and blew out a tire. now she heads out of town at high speed and straight for a bridge. >> i thought she might park the vehicle in a position to block our vehicles and then she would get out and run. >> as i'm falling behind, i see the door open and i think she is going to flee on foot. she is going right for the guard rail and i knew in my mind she is going to jump. >> officer costello makes one last plea. >> don't do it! >> take a look at that again. >> don't do it! she just jumped into the river. the suspect rebecca humphreys jumps 30 feet into the freezing water beneath her. the officer is just as amaz