While that is true, that most are committed by a spouse or other relative - or they hire someone to commit it so they have an alibi handy, but that leaves room for others, self-inflicted, as well as. It may also not be a gunshot wound. He's been in the water, which often times distorts. That's why they couldn't say definitively at the time the article was published. Thus the verbiage; appears to be a gunshot wound; was used.
Watching those shows as I have for years, I've seen all of the above determined as being what happened.