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Movies like Shot In The Back (1980)

First, there was a visit by a famous writer to his old friend, who then, in order to get rid of a random witness, killed him. Envy and money. Isn't that a motive for a crime? The police opened a criminal case, and the search for the perpetrator began. It turned out that there were many witnesses. But the weapon used to kill the writer has not yet been found...