Who killed 42 year old Mario Rivera in 1981? On December 10, 1981, Mario Rivera, a 42-year-old man, was found dead in a pond near NE Columbia Boulevard in Portland, Oregon. An employee of the Oregon Humane Society discovered what appeared to be a red parka in the water, which turned out to be Rivera’s body. The investigation revealed that Rivera had been beaten to death with a blunt object, likely a few days before his body was found. Witnesses had reported seeing the red object in the pond as early as December 7.
Rivera was kno
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