According to reports, yes, there was a passenger.
I didn’t know that, either, until I saw this video.
Summey also said there were no other witnesses to the incident hours
before the news of a second person in the car was made public. It’s
unclear now what that person saw.
http://www.abcnews4.com/story/28756118/latest-on-police-shooting-unidentified-passenger-in-car
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The police dash cam shows someone sitting in the passenger seat and never
leaves the car as long as the dash cam video is running for us to see.
It would be interesting to know what the person so or heard.