And you are also guilty until proven innocent.

I didn't find any travel warnings relating to Mexico from the US State Department or Canadian Foreign Affairs:

http://travel.state.gov/travel/cis_pa_tw/tw/tw_1764.html

http://www.voyage.gc.ca/dest/sos/warnings-en.asp

I did find an article from the CBC on the affair:

http://www.cbc.ca/story/canada/national/2006/03/03/mackay-mexico060303.html