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Police Bureau

Sworn to protect. Dedicated to serve.

Phone: 503-823-0000

Fax: 503-823-0342

Non-Emergency: 503-823-3333

1111 S.W. 2nd Avenue, Portland, OR 97204

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Case #81-100562

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 unsolved homicides can lead to a reward of up to $2,500 cash. All other unsolved felony crimes are eligible for cash rewards of up to $1,000.

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:

Text CRIMES (274637) - Type 823HELP, followed by the tip.

Online at

Call 503-823-HELP (4357)

Visit to download the TipSubmit app for the iPhone or Droid.