David Rupert is a former FBI/British intelligence agent whose testimony led to the arrest and prosecution of Michael McKevitt

Michael McKevitt

Michael McKevitt is an Irish republican who was convicted of directing terrorism as the leader of the paramilitary organisation, the Real IRA.-Background:...

, the reputed leader of the Real IRA, for the Omagh Bombing

Omagh bombing

The Omagh bombing was a car bomb attack carried out by the Real Irish Republican Army , a splinter group of former Provisional Irish Republican Army members opposed to the Good Friday Agreement, on Saturday 15 August 1998, in Omagh, County Tyrone, Northern Ireland. Twenty-nine people died as a...

. http://www.irishfreedomcommittee.com/NEWS/rupert/062903_irindep_intrigue.htm.

According to The Guardian

The Guardian

The Guardian, formerly known as The Manchester Guardian , is a British national daily newspaper in the Berliner format...

 "[i]t has emerged that when, in November 2000, it was first suggested to Rupert that he testify against McKevitt, the American informer balked at the idea ... [i]t is understood that he changed his mind after seeing a news report on the Omagh bombing. [s]ince agreeing to testify against McKevitt, Rupert has come under pressure to give evidence against other Real IRA and Continuity IRA figures, including Colm Murphy

Colm Murphy

Colm Murphy is an Irish publican and building contractor who was the first person to be convicted in connection with the Omagh bombing, but whose conviction was overturned on appeal...

, the only man convicted of offences relating to the Omagh bomb attack." http://observer.guardian.co.uk/nireland/story/0,,673163,00.html

David Rupert is reportedly in a witness protection program somewhere in the United States.