afternoon. >> two of them on the south end of the bridge. we hit one for sure. i'm not sure what happened to the other one, over. >> reporter: gregoire killed instantly. bridges airlifted to a nearby hospital. they are still investigating how and why the two got up on the bridge. the area is popular with photographers and nature lovers like gregoire posting this photo on instagram one week ago posing on the very same bridge where he lost his life. we've seen these terrifying train track accidents before. in july, these two women in indiana trying to outrun a freight train surviving incredibly by laying down flat on the tracks. >> you'd have to ignore these warning signs and climb over this seven-foot high barbed wire fence. despite the obvious risk, more