First of all, suicide is rather "permanent", so if you were doing something just to get back at your neighbor, that is an awfully costly way to do it. Or, if your original intention was to commit suicide, why bother to go to that effort to inflict blame on someone else. While, I guess if you wanted to protect a recent insurance policy from the suicide clause, that might be a bit of a motive, but most suicidal folks aren't likely to pick on someone else to that extent. The psychology that usually accompanies suicide is not consistent with that behavior.
Now, there are lots of things that will indicate whether or not the wound was self inflicted. The angle of trajectory of the bullet, the proximity of the gun barrel to the wound (close contact?) and the presence of gun shot residue on the decedent's hands are just a few.
Suicides are tough to investigate, because family members often go into denial, and would prefer to believe that their loved one was murdered. It requires a thorough and systematic investigation. Of course, the presence of a handwritten note or previous unsuccessful suicide attempts help solidify the investigation.
While the scenario you described is improbable, I don't doubt that it could happen. Anything can happen. But I don't think that a careful investigation, including a 'psychological autopsy' and study of physical evidence and comprehensive interviews would eventually reveal what really happened. I have investigated hundreds of suicides over the years and I think I could handle that one without too much trouble.
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