Who Is Jack DuCoeur? And Why Does ‘Half Of America’ Think He Committed Idaho Quadruple-Murder?

LATAH COUNTY, ID. (THECOUNT) — Who Is Jack DuCoeur? 22-year-old Jack DuCoeur is the man once considered a person of interest in the grisly murder of his ex-girlfriend, Kaylee Goncalves, 21, and three other University of Idaho students. No one has been arrested in the November murders.

Though DuCoeur was officially cleared by investigators, internet sleuths have perpetuated the theory that he is indeed the killer by presenting a number of curious clues.

DuCoeur dated Kaylee for 5 years when Goncalves unceremoniously “broke things off” just 3 weeks before the horror quadruple-murder.

It is known that Goncalves and Madison Mogen, another of the young girls killed, attempted to call DuCoeur 10 times in the hours leading up to the murders. According to records, he didn’t answer. It is unknown why the girls were attempting to contact him.

Police in Moscow, Idaho, later said they’d “looked into” and “cleared” the phone calls eventually declaring that DuCoeur was no longer considered a suspect.

“Detectives do not believe the male Kaylee and Madison attempted to contact numerous times on November 13th is involved in this crime,” Moscow police wrote on Facebook at the time.

In a “Reporter Room” YouTube video, host Jessica de la Davies pointed out several “red flags” in regards to DuCoeur’s involvement in the case — noting Goncalves had recently called it quits on the years long relationship, and that the dog they bought as a couple did not alert to an intruder and was not harmed during the massacre.

After mentioning Goncalves’ plan to relocate, Davies said, “we all know the most dangerous time for a woman is when she is trying to leave.”

Goncalves, Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20, were all found stabbed to death on November 13 inside a Moscow, Idaho residence they shared.

Brooke Miller, DuCoeur’s aunt, spoke out for the first time since the tragic murders saying her nephew is “surrounded by family and friends” as he grieves Goncalves‘ murder.

“He’s not only lost the love of his life, and what we all thought and he probably thought as well, would be his future wife — you know, get married and have kids and all of that,” but also, “half of America” thinks he could “be responsible” for the heinous killings, said Miller.

“Obviously he was sad, but they were still friends,” said the aunt, who would only say that Goncalves “was planning on moving away,” and their split was “amicable.”

“We all know, beyond a shadow of a doubt, that there’s no way that Jack would ever do anything like that to anybody,” his aunt concluded.

DuCoeur is a mechanical engineering major attending the same university.

The Goncalves family declined requests for comment.

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Geo quick facts: Latah County is a county located in the north central region of the U.S. state of Idaho. As of the 2020 census, the population was 39,517. The county seat and largest city is Moscow, the home of the University of Idaho, the state’s flagship until 2012 and land-grant university – Wikipedia.