Bystander

a person present but not involved; chance spectator; onlooker.
Contemporary Examples

D.C.’s Conservative Guru Finds His Inner Hippie Eleanor Clift June 26, 2014
How a Blogger Blocked Sex Slavery Abigail Pesta March 21, 2011
The Changing Face of Arlington Cemetery Joseph R. Chenelly May 28, 2011
In Los Angeles, Questions of Police Brutality Dog LAPD Christine Pelisek November 23, 2012
After No Indictment for Eric Garner Killer, Is NYC the Next Ferguson? Jacob Siegel December 2, 2014

Historical Examples

A Laodicean Thomas Hardy
The Underdog F. Hopkinson Smith
Wilson’s Tales of the Borders and of Scotland John Mackay Wilson
The Web of the Golden Spider Frederick Orin Bartlett
Phineas Finn Anthony Trollope

noun
a person present but not involved; onlooker; spectator
n.

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