[n. ahy-wit-nis, ahy-wit-nis; v. ahy-wit-nis]
a person who actually sees some act, occurrence, or thing and can give a firsthand account of it: There were two eyewitnesses to the murder.
verb (used with object)
to view with one's own eyes: to eyewitness a murder.

1530–40; eye + witness

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World English Dictionary
eyewitness (ˈaɪˌwɪtnɪs)
a.  a person present at an event who can describe what happened
 b.  (as modifier): an eyewitness account

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s (n.), 1844 (v.), from eye + witness. Related: Eyewitnessed; eyewitnessing.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So your eyewitness is unreliable by definition, unless of course they have a
  video of the event.
At the same time, military historians all know the danger of accepting
  eyewitness accounts.
None of the telegrams could have been written by an eyewitness of their advance.
It was as though an eyewitness from antiquity had stepped forward with
  photographs of the disaster.
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