In the long run, it was a discarded piece of chewing gum, casually spit on the bottom in 2021, that was the important thing to fixing the cold-case homicide of a school scholar that had confounded the authorities in Oregon for greater than 4 many years.

Robert Arthur Plympton had been underneath police surveillance for the reason that authorities decided that 12 months that he was a “possible contributor” to a DNA profile developed from swabs taken from the physique of Barbara Mae Tucker, who was 19 when she was murdered on the Mount Hood Neighborhood School campus in 1980.

On Friday, Mr. Plympton, 60, was discovered responsible of murdering Ms. Tucker after a three-week bench trial in Portland, Ore. In accordance with The Oregonian, which reported on the investigation and Mr. Plympton’s conviction, it was the oldest cold-case murder in Gresham, Ore., east of Portland.

On the evening of Jan. 15, 1980, Ms. Tucker was anticipated at a category on the faculty, the place she was finding out enterprise. She by no means arrived.

College students on their approach to class the following morning discovered her “partially clad” physique on a shrub-covered slope close to a campus car parking zone, The Oregonian reported on the time. There have been indicators that Ms. Tucker had been sexually assaulted, and that she had struggled together with her assailant.

For many years, the authorities had been unable to establish a suspect or make an arrest.

Step one towards a breakthrough within the case got here in 2000, when vaginal swabs that had been taken throughout Ms. Tucker’s post-mortem had been despatched to the Oregon State Police Crime Lab for evaluation. Lab technicians had been then capable of develop a DNA profile from the swabs.

In 2021, Parabon NanoLabs, a Virginia firm whose companies embrace DNA-based forensics, recognized Mr. Plympton as “a possible contributor to the unknown DNA profile developed in 2000,” the Multnomah County district legal professional’s workplace said in a statement. It was not clear how the DNA connection was made; the district legal professional’s workplace didn’t instantly responded to a request for touch upon Tuesday.

Detectives with the Gresham Police Division discovered that Mr. Plympton was dwelling in Troutdale, Ore., east of Portland and northeast of Gresham, and commenced surreptitiously watching him, prosecutors mentioned.

When investigators noticed Mr. Plympton spit a bit of chewing gum onto the bottom, they collected it and submitted it to a state police crime lab, prosecutors mentioned.

“The lab decided the DNA profile developed from the chewing gum matched the DNA profile developed from Ms. Tucker’s vaginal swabs,” the district legal professional’s workplace mentioned.

Mr. Plympton was arrested on June 8, 2021, as he was driving away from the Troutdale residence he shared together with his spouse and son, The Oregonian reported.

He had a felony report, together with a conviction for second-degree kidnapping in Multnomah County in 1985, in line with the Oregon Division of Corrections.

Mr. Plympton was 16 when Ms. Tucker was murdered. Witnesses reported seeing her with a person the evening she was killed, and a number of other individuals reported seeing her run into the road waving her arms, maybe attempting to flag somebody down for assist, The Oregonian reported.

Kirsten Snowden, the Multnomah County chief deputy district legal professional, mentioned on the trial that there was no proof that Ms. Tucker and Mr. Plympton had identified one another, in line with The Oregonian.

Mr. Plympton’s lawyer, Stephen Houze, mentioned on the trial that there was “unmistakable, unavoidable cheap doubt” about who killed Ms. Tucker, in line with The Oregonian. He mentioned that witnesses had described the person who was seen with Ms. Tucker — who was practically six ft tall — as being about her top or taller, however Mr. Plympton was nearer to 5-foot-8. He additionally mentioned investigators by no means examined Ms. Tucker’s clothes for DNA proof.

“We’ll enchantment, and we’re assured that his convictions might be overturned,” Mr. Houze and his legislation accomplice Jacob Houze mentioned in an announcement on Tuesday.

Choose Amy Baggio of Multnomah County Circuit Court docket discovered Mr. Plympton responsible of 1 rely of first-degree homicide, and 4 counts of “totally different theories of homicide within the second diploma,” in line with the district legal professional’s workplace.

“To be clear, this courtroom has zero doubt in any respect that Robert Plympton beat Barbara Tucker in her head and face till she died,” she mentioned on the trial. “He did.”

Choose Baggio didn’t discover Mr. Plympton responsible of sexually assault, saying that prosecutors had didn’t show past an inexpensive doubt that he had assaulted Ms. Tucker whereas she was nonetheless alive, The Oregonian reported.

Mr. Plympton is scheduled to be sentenced on June 21. Primarily based on his age on the time of Ms. Tucker’s dying, he faces a life sentence with the potential for parole after 30 years on the first-degree homicide cost.

Two members of Ms. Tucker’s household wept and embraced after the decision was introduced, in line with The Oregonian. Ms. Tucker’s older sister, Alice Juan, mentioned in assertion on Tuesday that her household was “thrilled that this was lastly solved.”

“I assumed it may not be because the years went on, however Barbie was a particular little lady,” she mentioned. Her little sister, she added, “was shiny, bubbly, caring, all of these issues.”

Kitty Bennett contributed analysis.



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