Knowing how the machismo characteristic is so prevalent in Mexico, I would estimate this was murder if Adam DePrisco was dancing with the girlfriend of a machismo mexican male. If I were a family member of DePrisco, the first interview should have been with the girl that Adam was dancing with, and most likely she would have been beaten as well.
Do not look for any truths to come from the government, military, politician, investigators, or police ... because mexico is one of the most corrupt nations on this planet.
Another suggestion is that anyone who plans to vacation in mexico should cancel their plans, for the past year there has been hundreds of murders and beheadings:
http://www.nytimes.com/2006/10/26/w...8d189d79b1efdc&ei=5088&partner=rssnyt&emc=rss
http://www.signonsandiego.com/news/mexico/20070110-1305-mexicomilitaryacapulco.html