Thank you so much for being able to give us some details. Except about the "note". There was a "suicide" note? His handwriting? Had you witnessed his concern about MS, and was it mentioned in the note, or did she just claim he was depressed about that? People where he worked didn't say anything like that or notice any depression?
Maybe I should list some obvious questions, and I'm sure others will have better ones.
(1) Note (His handwriting or typed? Long one? You personally saw it?)
(2) Footprints in the woods? Two sets?
(3) No depression noticed by family/friends?
(4) Very ODD time to go hunting, when he was expected at work! Did he normally walk the dogs in the woods?
(5) Have you talked to any of the people SHE'd worked with for 7 or 8 yrs?
And at the new job she only kept for a short time? Did she maybe feel they were suspicious of her, reason she left? Had she been acting any different or did she talk about troubles in the marriage?
(6) You did tell LE that your brother was left-handed? And his co-workers would testify to that, even if his wife might not? If they didn't know that, they'd assume suicide.
(7) His being cleaned up afterwards shows it wasn't suicide, right? Maybe someone used some kind of covering preventively so there were none of the usual residues? Dead people can't clean up their remains or a crime scene.
(8.) Does it seem like she had someone in the house when Jack returned from walking his dogs, who made him lock them in a room, then took him around the woods to the other side, 3 miles away, and dumped him off the trestle, already cleaned up?
(9) How was he found so soon? He was in plain sight from a road? There's a road that goes there, right? It wasn't necessarily a neighbor who found him, just someone driving by?
(10) Is that officer still there who told you she was "stoic"? Could you take your daughter or your mother or someone with you and talk to him again? Does it seem like LE people were afraid to do more investigating for some reason, or protecting one of their own to keep their jobs?
William Casey, a former head of CIA if I'm not mistaken, wrote a book expose of that "renegade" CIA titled "Honorable Men", about the Vietnam War if I'm not mistaken.
Somewhere I read something about his being forced to write a note and being taken out in a small boat, evidently knowing he wasn't coming back. Can't remember if he "fell" overboard or what. And if someone was just speculating because he'd written the book.
Could your brother have been involved with any "clandestine" people or ordinary bad guys because of his being a programmer for IBM? Did the widow personally know any of the bad cop guns for hire, alleged in the newspaper article? We're looking for a missing link. Was she very sociable? I'm guessing no. Neither of them ever went to bars? You saw the "note", and did it look like his handwriting?
Finally, sorry to have to ask but it's a big part of the total picture, was your brother a youngest, reason he saved his money and didn't help you out? His wife couldn't spend it to run the house either? Did they go places together? To church? Had he quit going when he grew up? Does she go now? They had absolutely no friends together? I'm sure they didn't frequent bars, right? If they did, that's probably where contact was made with the killer, I'm sure you realize, unless it was business connected. Interesting case. Thanks for letting us try our hand with it.
Quoting a section of your post, copy/paste, where I think you meant to say 6 hrs AFTER instead of "prior to"......................................................
" I have no idea where the other one (dog) is, but they was found in a room in their house locked in?!
He was expected at work, and his wife said she seen him before she left for work....He was found at 5:30 pm, supposedly 6 hrs prior to being shot. He supposedly walked 3 miles into the woods with a loaded 357, the holster was still in a nightstand in their room...
He supposedly shot himself because he "thought" he may have MS, and din't want to be a burdern to his wife... Cough, choke again....He did NOT have MS, nor anything other than carpel tunnel, from being a computer programmer, and went to work the day before with hand splints?! And again, he was completely left handed, played golf and tennis left handed, but was shot in the right temple, again, with NO powdering or tattooing, and NO splatter anywhere on him or his clothes...
The car was left at his home, and there is something there too I cannot say to let some key evidence out...
The detective quoted, when his body was found, his wife's reaction was STOIC, then she asked what to do with his remains?!?!?! " ....................
About the car and key evidence, aren't you already letting us in on a lot of key evidence? Why would that be any different? Any strange FINGERprints, FOOTprints? Did they keep his fingerprints on file to compare with any they might find, in his car or on doorknobs or his gun? If the killer covered him, I'm sure he knew how not to leave fingerprints but no harm in asking.