On December 10, 1981, an employee of the Oregon Humane Society was near a pond on the 1000 block of NE Columbia Boulevard at approximately 12:40 pm, when he observed what looked to be a red parka in the pond. Upon further inspection, he discovered that it was a deceased individual. Police responded to find the victim, Mario Rivera, a 42-year-old Hispanic man. An autopsy revealed that he had died as the result of being beaten about the head with a blunt object.
Mario Rivera was described, by most individuals interviewed, as being rowdy and was frequently drunk. He was also reported to be verbally abusive and disrespectful.
Witnesses reported seeing a red object in the pond, similar to his parka, as early as Monday, December 7.
Witnesses may contact Cold Case Homicide Unit investigators directly at (503) 823-0400. To remain anonymous, witnesses may provide information through Crime Stoppers of Oregon.
Crime Stoppers of Oregon offers cash rewards for information, reported to Crime Stoppers, that leads to an arrest in any unsolved felony crime and tipsters can remain anonymous.
Information about this case or any unsolved felony crime may be eligible for a cash reward of up to $2,500.
Information learned from social media sites such as Facebook, Twitter or YouTube should be shared as these tips may lead to the identification of a suspect or suspects. Links can be shared anonymously through Crime Stoppers.
Submit an anonymous tip:
Visit the App Store and download P3 Tips to submit secure and anonymous tips.
Online at https://www.p3tips.com/823
Call 503-823-HELP (4357).