He was rushed to the Mater Hospital where he sadly passed away yesterday afternoon.
A book of condolences has also been set up at the store in memory of the late shopkeeper.
Local Independent councillor Nial Ring said: “It’s an absolute tragedy, I’ve been there and it’s a very well known shop used by a lot of people.
“He was just a guy going about his business trying to make a living, and for something like this to happen is an absolute tragedy
“Unfortunately, people don’t like trying to take the law into their own hands but it’s a natural reaction when somebody robs your shop.