Bystander

A bystander videotaped the police beating using their cell phone.

I'm just an innocent bystander.

Tom was an innocent bystander.

The incident happened to be captured on video by a bystander.

Tom wasn't just an innocent bystander.

Tom wasn't an innocent bystander.

A bystander captured it on video.

The method requires a rescuer or bystander to place his or her fist on the femoral artery, between the hip of the wounded leg and the genitals, and apply pressure using their full body weight to stop blood flow to the leg wound.

The con artists needed a patsy to take the fall, so they framed an innocent bystander.

If he wins, he will be at liberty, perhaps, to give vent to a laugh, or to pass a remark on the circumstance to a bystander, or to stake again, or to double his stake; but, even this he must do solely out of curiosity, and for the pleasure of watching the play of chances and of calculations, and not because of any vulgar desire to win.