May 24 (Reuters) - Two bodies believed to be the remains of a Washington state couple missing and presumed slain since last month were found buried in a shallow grave on Tuesday as one of two suspected killers in the case pleaded not guilty to murder charges.
Information furnished by Tony Clyde Reed, 49, arrested more than a week ago at the U.S.-Mexico border in San Diego, helped authorities pinpoint the location of the makeshift burial site, said Shari Ireton, spokeswoman for the sheriff's office in Snohomish County, Washington.
Reed, jailed on $5 million bond, pleaded not guilty on Tuesday to two counts of murder and one count of unlawful possession of a firearm. His brother, John Reed, 53, remained a fugitive and may still be in Mexico, Ireton said.
RELATED: Notable cold cases:
Notable cold cases and unsolved murders throughout history
Bodies believed to be slain couple found in Washington state
In June 1893 Lizzie Borden stood trial, later acquitted, for killing her father and stepmother with an ax. (Photo via Bettmann/Getty Images)
Foreboding Kingsbury Run, shunned by the timid as the legend of its murders has grown, is indicated on this map by dots locating 10 of the 11 torso murders which have occurred there since Sept. 23, 1935. Police, delving into the lives of the mad murderer's victims, hope to uncover clues which will end the periodic killings. Discovery of photo negatives in the belongings of Edward Andra Ssy, first victim, show Andra Ssy in a strange room which, if identified, may provide a live lead, police believe. As the map shows, the murderer departed only twice from his custom of assailing victims in Kingsbury Run or adjacent Cuyahoga river valley.
Bucks Row, now Durward Street, east London, where the body of Mary Ann Nichols, victim of Jack the Ripper, was found lying across the gutter. (Photo by Hulton Archive/Getty Images)
Head shot of aspiring actress Elizabeth Short, a murder victim nicknamed the Black Dahlia (Photo via Bettmann/Getty Images)
UNITED STATES - JUNE 26: Daily News front page dated June, 16, 1990, Headline: IS HE THE ZODIAC?, Police sketch of man who approached latest victim in Central Park last Thursday and asked him his birth date., June 26, 1990 . , Zodiac Killer. , Heriberto Seda. Headlines. IS HE THE ZODIAC ?, (Photo by NY Daily News Archive via Getty Images)
U.S. labor leader Jimmy Hoffa is photographed at the Greater Pittsburgh Airport, Pennsylvania in this April 12, 1971 file photograph. Hoffa was switching planes from San Francisco, and was returning to the federal prison in Allenwood, Pennsylvania. Hoffa was let out of prison to visit his wife, who had been hospitalized with heart problems. FBI teams on May 25, 2006 sifted by hand through dirt from a chest-deep hole in the ground in an intense search for the body of Jimmy Hoffa three decades after his disappearance. Hoffa was last seen outside a Detroit-area restaurant where he was to meet New Jersey Teamsters' boss Anthony "Tony Pro" Provenzano, a member of the Genovese crime family, and a local Mafia captain, Anthony "Tony Jack" Giacalone. Hoffa was declared dead in 1982, and numerous books about his life have pinned his disappearance on mobsters who murdered him because they did not want him interfering with their close ties to the union. B/W ONLY REUTERS/Jerry Siskind
The site where 6 year old JonBenet Ramsey was killed in Boulder, Colorado, 1996. (Photo by Karl Gehring/Liaison)
Black car in which rapper Tupac Shakur was fatally shot by unknown driveby assassins as he was riding w. friend Death Row records. pres. Marion Suge Knight, who survived shooting, behind police tape at crime scene (Photo by Malcolm Payne/The LIFE Images Collection/Getty Images)
Los Angeles Police detectives released this composite drawing March 27 of the man they believe killed rap star Notorious B.I.G. in Los Angeles recently. The suspect, a black man in his early 20's with close-cropped hair, was wearing a bow-tie the night of the drive-by killing. Investigators have set up a toll free number for the public to call with any information about the suspect.
Donna Norris poses next to a photo of her daughter Amber Hagerman, January 4, 2011, who was kidnapped 15 years ago while riding a bicycle near Norris mother's home in Arlington, Texas on January 13, 1996. (Richard W. Rodriguez/Fort Worth Star-Telegram/MCT via Getty Images)
Discover More Like This
BACK TO SLIDE
The two siblings are suspected of killing Patrick Shunn, 45, and Monique Patenaude, 46, a married couple reported missing on April 12 by friends in the foothills of the Cascade mountains, about 60 miles (97 km) northeast of Seattle.
John Reed was a neighbor of the couple in the Oso area, which was hit by a deadly mudslide in March 2014, and Shunn had reported to police that he and his wife had been threatened by Reed in a property dispute.
Based on evidence uncovered in the initial search for the couple, detectives concluded they were victims of foul play, but more than a month passed without any sign of their bodies.
Ireton said the remains of a man and woman were finally discovered in a remote, wooded area a few miles (km) north of the couple's home and near the spot where their two cars were found abandoned in April.
Authorities believe the bodies, which were buried together, are those of Shunn and Patenaude, though medical examiners have yet to positively identify the remains, or to determine the cause and manner of the death, Ireton said.
Sheriff's investigators said the Reed brothers both fled to Mexico following the couple's disappearance. The younger brother turned himself over to U.S. marshals at the border on May 16 and was extradited back to Washington.