A couple of scholars published biography on van Gogh that theorizes he was actually the victim of either manslaughter or straight up murder.
They have a few pieces of evidence to back this up: The bullet went into his stomach at an oblique angle, not a straight one as might be expected. In private correspondence, van Gogh had also said he considered suicide sinful and immoral.
Furthermore, they claim that there was a businessman that confessed to shooting him. On his death bed, however, Van Gogh said "Do not accuse anyone... It is I who wanted to kill myself."
The authors of this theory think that he was trying to protect his killers. However, other prominent van Gogh scholars think that this theory isn't 100% convincing. Specifically, they claim that the businessman who confessed to shooting van Gogh was misinterpreted.
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