A tragedy for sure for everyone involved. And also a sobering example of how martial arts aren't always as effective as people believe in keeping people safe:http://www.bbc.co.uk/news/uk-northern-ireland-23588174
A brief bit about his MA background:http://www.belfasttelegraph.co.uk/news/l...n-29482300.html
Based on his location in NI, he would've been studying with the TAGB (Chang Hon TKD, off-shoot of ITF) and the World Ju Jitsu Federation (westernised version of traditional JJ), which the article doesn't make clear.
It is currently unclear as to what instigated the incident and who attacked who but regardless, it is still a tragedy for all involved.