up onto the sidewalk. i believe she hit a rock or retaining wall there and blew out a tire. >> but the suspect keeps going, now heading 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. >> but then, the unexpected happens. >> as i'm falling behind, i see the door open, i think she's going to flee on foot. before i know it, she goes right for the guard rail and i knew in my mind, she's 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. >> suspect rebecca humphries jumps 30 feet into the freezing water beneath her. >> i was completely shocked by that. >> officer lee is just as amazed. >> i have been three on these bridge jumpers and the other two