How is it that you talk about a man with his hands strapped and strangled, add your own thoughts about it being a 'kinky' act gone wrong, and then in the same paragraph offer condolences to the family???
If your son/daughter was involved in a terrible accident would you appreciate people openly speculating about his/her lifestyle or cause of death? Probably not. As far as the family is concerned, they probably wish this was not in the news at all, let alone to have random strangers aware of the intimate details and speculating about the acts leading up to their loved one's demise.
If you're concerned about the family, just offer your condolences. IMO it is in poor taste to speculate on the cause of a person's death and then cover your ass with condolences to the family.