An IRA source has been discovered dead at his home, it was accounted for the previous evening.
The disintegrated group of Raymond Gilmour, 55, was found at his level in Kent by his 18-year-old child from his second marriage.
The passing is not being seen as suspicious.
Gilmour, from Londonderry, was included in a few IRA operations in the vicinity of 1977 and 1982, for the most part as a driver.
He gave data that drove RUC officers to a M60 automatic rifle, and 100 captures were made.
Gilmour gave confirm against 31 men and ladies in a supergrass trial, and after the case fell in 1984 he was given another character by MI5 and settled in Britain.
He is said to have experienced liquor abuse and mental issues.
He had no contact with his better half and two youngsters in Ulster, yet wedded twice more in Britain.