No homicides, but 2 men were shot at a Young Jeezy hip hop concert in London:
http://www.torontosun.com/2012/04/06...-in-london-ont
Interestingly enough, someone else was shot at another Young Jeezy show in Toronto a few days earlier and was listed in serious condition. The "next stop, London, Ontario" tweet seems a little prophetic:
http://news.nationalpost.com/2012/04...jeezy-concert/