Quoted:
Capital Punishment. Burn that p.o.s alive is what I'd do.
Hold on, a guy wades into a fight at 2:40AM(no drinking involved there, right), and ends up getting tragically killed when he gets knocked down and falls and hits his head. This hardly calls for capital punishment. A tragedy, but still just an accident, unless you guys know more about the incident than what is posted in the ynn link above. Someone mentioned defending a friend from a group of thugs, I didn't see that in the article. If that's the case, then it's a much different story.
ETA––A snip from the latest NBC news story on the incident.
Patrick Casey died after the altercation. Casey's parents said they believed their son was breaking up a fight, but on Friday, police confirmed that Casey was involved in the fight.
Casey or someone else in the group he was with hit or punched another individual and then Casey was punched. Police said he fell to the ground and hit his head, leaving him brain dead.
Police said they have interviewed all the suspects involved in the case.
http://www.nbcwashington.com/news/local/GW-Student-Was-Part-of-Altercation-130883758.html
ETA2––If you look at the more complete articles on this incident, you'll notice that all the hero breaking up a fight, and suckerpunch comments are coming from quotes from Casey's mother. This appears to have been a tragic case of boys being boys at 3AM, and fighting after possibly, just possibly "imbibing" where someone, who happened to be a hero for other things he has done in his life, ended up dying as an unforseen and accidental outcome. No need for the electric chair or hangman's rope here.