The victim of a suicide attack in Kabul had been living with his fiancee in County Londonderry, Northern Ireland.
Mr Chase's fiancee Norma McDowell was being comforted by family and friends after learning of the news.
It is understood the couple lived together with two children in the Drumachose Park area of the town.
The ex-Cheshire Regiment soldier had worked as a nightclub doorman in Limavady before travelling to Kabul to work in the security industry.
More top news
Three others died on the day of a sightseeing helicopter accident at the Grand Canyon.
We're on the cusp of of some deep rooted cold air from Siberia.
The aid organisation has had its in-country operations suspended for two months while officials investigate abuse claims from 2011.