TODAY | March 08, 2014
>>> we begin this half hour, though, with the search that went viral to find a person who had helped a driver who had been in a pretty terrible car accident . john yang has the story.
>> reporter: for erin purbort, minneapolis rush hour that afternoon is all a blur.
>> was about three minutes away from home and woke up in an ambulance.
>> reporter: purmort, who has stage 4 brain cancer , had suffered a seizure.
>> the last thing i remember is driving past taco bell .
>> reporter: aaron blocked out in the middle of a busy intersection like this one, his car still in gear, his foot apparently on the brake, but not a scratch on him or his car. some might say someone was looking out for him, and in a way, someone was. at the emergency room , aaron 's wife, norah, found his car keys in his jacket pocket along with a note.
>> your car is parked in the tobacco shop parking lot at 18th avenue northeast in stinson.
>> reporter: it wasn't sign. no clues who wrote it. on facebook, it went viral. it took a week for aaron 's good samaritan to come forward. kyle seaverson, a 16-year veteran of the minneapolis police who responded to a report of a man slumped over in a car. after aaron came to --
>> we asked him what month it was, and he said december, and asked him what year it was, he said 2003 . then i asked him, you know, do you want me to park your car for you? he told me he doesn't drive, he takes the bus.
>> reporter: proper procedure was to impound the car, but seeing aaron 's scars from brain surgery , seaverson decided to park it instead.
>> i figured he had enough on his plate already.
>> reporter: to seaverson, it was no big deal .
>> it took two minutes of my time to make a good call great. it wasn't a lot of effort on my part. if i thought it was a big deal , i would have spent a little more time on my penmanship and printed a little neater.
>> reporter: to aaron and norah, it meant so much.
>> the nice little things in life really do go a long way.
>> reporter: an officer living up to his department's motto, to serve with compassion. for "today," john yang , nbc news, chicago.