It seems Fitzsimmons was an undercover army agent. he was working in the south Armagh area and was killed in 1998. His death just read that he was “security” but its noted that his funeral was a military affair. His uncle was the commander of Special Branch in Newry (also Fitzsimmons) but the highlight was on the younger nephew Don Fitzsimmons, he was thought to be from the Tandragee area in County Armagh and was responsible for the kidnapping of innocent men they thought to have links in IRA membership around the south Armagh area.

The Fitzsimmons family in the Armagh area have strong links to the army and its rumoured that 2 of the men are in special forces, as well as RUC special branch and army intelligence.