Chelsea Shipp’s plea and Cody Arnold’s jury trial produced separate prison terms in a killing prosecutors said both defendants helped bring about.
JEFFERSON COUNTY, Texas — By the time Cody Arnold was sentenced to 34 years in prison in March 2026, one fact had already been settled in the killing of 16-year-old Katelynn Stone: the courts had concluded that two adults, not one, bore responsibility for her death.
That is what makes the case stand out in the public record. Chelsea Shipp had already pleaded guilty and received 40 years in prison for shooting Stone in March 2022. Arnold, who prosecutors said was Stone’s boyfriend and feared being exposed after she tested positive on a pregnancy test, was later convicted by a jury and punished separately. The two sentencings, nearly a year apart, gave the case a split structure. One proceeding fixed the role of the admitted shooter. The other asked jurors to decide whether the man at the center of the alleged motive was equally part of the murder plan.
The investigation itself unfolded in stages that made that shared-blame theory easier for prosecutors to tell. Deputies were called to Arnold’s residence on the 14000 block of Kolb’s Corner around 5 p.m. on March 27, 2022, and found Stone dead from a gunshot wound. Arnold was arrested at the house that same day. On March 29, the sheriff’s office announced that a murder warrant had been issued for Shipp, then 24, and warned that she was believed to be armed. Authorities also said she was known to frequent Galveston County, Chambers County and West Jefferson County and identified a white Dodge pickup they believed she had used. Two days later, deputies arrested her at about 3:40 a.m. in Liberty Hill with the help of local police and the Williamson County Sheriff’s Office.
Those steps mattered because they gave the public a case map before most courtroom evidence was known. First came a body in a house. Then one arrest at the scene. Then a second suspect sought across county lines. Then the formal identification of the victim as Katelynn Nicole Stone of Vidor. In time, witness accounts and court reporting filled in what officials had left unsaid in those early bulletins. Prosecutors said Arnold and Shipp had spent the weekend together at the house, talking about killing Stone and using meth. Arnold’s own reported statement placed him in the home when the shooting happened and described him seeing Shipp point a gun at Stone while the teen slept. He also reportedly admitted covering Stone’s head with a trash bag afterward because he did not want to look at her.
The state’s burden changed depending on which defendant stood before the court. In Shipp’s case, prosecutors secured a plea. At sentencing in June 2025, local reporting said she admitted shooting Stone and that a witness had reported hearing her say she did it because the girl was pregnant and Arnold would “get in trouble.” The reporting also described the body as wrapped and left on the bed with a shell casing on a pillow next to it. Arnold’s case required more. Prosecutors had to show not only motive but participation. They answered with testimony that the alleged pregnancy created fear about criminal consequences, with statements that Arnold believed he had gotten Stone pregnant, and with evidence that the killing was discussed beforehand rather than carried out on impulse.
Witnesses became the bridge between those two prosecutions. Investigators said Shipp had been talking to people after the shooting, telling one woman, “I got rid of her,” and saying, “I shot her,” while making a shooting gesture. Another account said she told investigators she killed Stone at Arnold’s request. When asked why, she allegedly answered, “Because one of them was sleeping around on the other.” Those quotes did not make the public story simpler. Instead, they showed how the case moved on several tracks at once: alleged fear over pregnancy, anger over betrayal, drug use in the days leading to the shooting, and steps taken after the killing to hide or distance themselves from what had happened. Some details, including whether any pregnancy was medically confirmed in public court filings, remain unclear from the open reporting.
By March 2026, the courtroom focus had narrowed to punishment. Arnold, then 25, had been convicted, and jurors were left to choose a sentence. He faced up to life in prison. They gave him 34 years. That number was lower than Shipp’s 40-year term, but it still reflected the jury’s acceptance of the prosecution’s central claim that Arnold was not a bystander to Stone’s killing. In effect, Jefferson County’s courts divided the same homicide into two forms of accountability: the sentence for the person who admitted firing the shot, and the sentence for the person jurors found shared the purpose behind it.
For the communities tied to the case, those paired outcomes form the clearest arc. Stone was from Vidor. Arnold was from Beaumont. Shipp was from Winnie. The crime scene lay in a rural pocket of Jefferson County, yet the investigation stretched to Liberty Hill and drew help from agencies outside the region. What began as a sparse sheriff’s office bulletin became a four-year legal process that touched multiple towns, multiple courts and multiple versions of motive, but always returned to the same ending: a teenager was killed in a bedroom, and both adults linked to the act were sent to prison for decades.
The record now appears largely complete unless Arnold pursues appellate review. With both defendants sentenced, the case has moved from active prosecution to the slower phase of judgments, filings and any later court challenges.
Author note: Last updated April 17, 2026.