The 1995 slaying of Adrianne Jones, an exuberant Texas high school student, is being re-examined in Monday night's episode of People Magazine Investigates

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The brutal 1995 slaying of Adrianne Jones, an exuberant and well-liked Texas high school student, is being re-examined in Monday night’s episode of People Magazine Investigates, on Investigation Discovery.

The case surprised investigators from beginning to end, as PEOPLE Senior Editor Alicia Dennis explained in a Friday appearance on People Now. “[Adrianne’s] body was found in a rural area in Mansfield, Texas, and the whole community was just appalled,” she said.

More surprising still was the truth of who killed Adrianne.

Investigators say David Graham and Diane Zamora, two of Adrianne’s classmates — and high school sweethearts themselves — confessed to her killing, which Zamora ordered in a jealous rage when she learned Jones and Graham had once had sex.

As one of Zamora’s family friends told PEOPLE in 1996, “I remember being flabbergasted when I heard Diane had been arrested. I kept saying, ‘This can’t be the same Diane Zamora. There must be some mistake.’ ”

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Dennis said on People Now that the couple, who had both been accepted to military academies after high school, before their arrests, was caught in part thanks to their fellow students.

“It has to do with Diane talking to her fellow cadets at the Naval Academy and some things getting shared there that they felt they had to share,” Dennis said.

Zamora and Graham were convicted in Jones’ murder, but Zamora maintains her innocence and is no longer with Graham.

She will speak out on Monday’s People Magazine Investigates — describing some of what she says led up to Adrianne’s killing.

People Magazine Investigates’ episode on the Jones case airs Monday (10 p.m.) ET on Investigation Discovery.