bystander
An innocent bystander was hit and killed by a stray bullet.
Dozens of innocent bystanders who just happened to be in the square at the time were wrongly arrested by the police.
If you have profited from these crimes, you are not innocent bystanders, and deserve to be prosecuted to the fullest extent of the law.

SMART Vocabulary: related words and phrases

Audiences and spectators
behind closed doorsidiom
bums on seatsidiom
bystander
captive audience
casual observer
consumption
evangelistically
fan park
fly on the wallidiom
flâneur
goer
non-viewer
observer
onlooker
operagoer
pep rally
spectator
supporter
viewership
watcher