Theory I have but can't prove is that a huge number of accidental gun deaths and suicides are murders that the cops are just too lazy to investigate https://people.com/human-interest/dog-shoots-kills-owner-freak-hunting-accident-kansas/
@mtsw
TV Detective: The killer was extremely careful and left almost no physical evidence. But they made one crucial mistake, and that has been the key to cracking this entire case...
Real-life Detective: I don't know, maybe the dog killed him.