Witness noun – Someone who sees an event and reports what happened. Informant is a synonym for witness. You can use "Informant" instead a noun "Witness". Nearby Words: witnessed, witnessing
The Mentalist: In "Red Sauce", the CBI's murder investigation gets a lot more complicated when the victim, who worked at a local video arcade, turns out to be a mob informant in witness protection.
A mob informant for the FBI cops to the murder his identical twin brother (a professor at a university) committed, and even killed a witness who identified the professor.