When a man dies due to someone touching his balls, i don't think this is not the way they invision going.
As little as I know about medicine, this doesn't really sound that implausable. Severe shock from pain could cause underlieing issues to come into play, I would think.
He may have had something going on (high BP, heart issues, ext) which was exsaberated by the ball grabbing. Same thing happens when guys who shouldn't take ED drugs get off.