A witness is someone who has firsthand knowledge about an event. An expert witness is a person who by virtue of education, training, or experience, is believed to have expertise in a particular area. A different type of witness is an eyewitness, who is a person that saw a specific event first hand. A witness can be extremely important for court proceedings. They are vital for news articles that expose government secrets. In some cases, investigative journalists can become an expert witness after conducting deep research into a controversial subject. This article will examine ten famous witnesses that suddenly died. In every case, the deaths are suspicious and have spawned a collection of conspiracy theories.