Suvechha Sarkar
Katelyn Helene Markham was looking forward to her graduation from college within a few weeks in August 2011. However, around the same time, the 21-year-old art student unexpectedly went missing from her house in Fairfield, Ohio. Nearly 2 years later, officials uncovered her remains in a wooded area in Cedar Grove, Indiana, and the case soon turned into a homicide investigation. NBC’s ‘Dateline: The Butterfly’ focuses on the years-long investigation that raised questions about someone close to her. Furthermore, the episode features interviews with the authorities and her loved ones.
Katelyn Markham’s Remains Were Found Almost 2 Years After She Disappeared
Katelyn Helene Markham arrived in the world as a ray of sunshine on August 16, 1989, in Ohio. Although public reports do not mention details about her biological parents, we know that she was adopted by Dave and Sherri Markham when she was just a baby. They raised her with immeasurable love and support, pushing her to utilize her potential. Katelyn’s loved ones remembered her as someone with a cheerful personality and a creative spirit. After graduating from Fairfield High School in 2008, she decided to pursue her passion for art. Katelyn went on to earn her first degree before she enrolled at The Art Institute of Ohio – Cincinnati to study Graphic Design.
Katelyn was living at a house in Fairfield, Ohio, with her pup, Murphy. In high school, she crossed paths with John Allen Carter, and within a short period, they formed a strong connection. They had been dating for 5 years when he proposed to her in August 2010. By August 2011, she had been working at a bridal shop, David’s Bridal, for six months and was planning to move to Colorado with John. Things changed on August 14, 2011, when he called 911 to report that his fiancée was missing and claimed to have last seen her the previous night. When officials reached the scene, they found her wallet, containing $300 in cash and her driver’s license, inside the house. They noted that her car was parked outside the home, but were unable to find her cellphone.
Several months passed in search of Katelyn, but she was nowhere to be found. On April 7, 2013, officials received a call from a couple looking for scraps when they found human skeletal remains in a wooded area and an unofficial dumping site along Big Cedar Road in Cedar Grove, Indiana. Forensic experts noted that the skull was tied inside a plastic grocery bag. However, they deduced that the remains had been moved there from another location. The remains were identified as Katelyn’s through her dental records. The autopsy revealed that she had a few cut marks on her left wrist, which were consistent with sharp-force trauma. Although her manner of death was ruled a homicide, her cause of death remained undetermined.
Several Witness Statements Led Officials to Focus on Katelyn’s Fiancée
During the initial investigation, officials questioned John first. In his statements, he told them that he and Katelyn spent time together with their mutual friend, Brad von Bargen, on the night of August 13, 2011. John went on to say that after Brad’s departure, the 21-year-old decided to stay home, while John met some friends around 11:30 pm before going to his mother’s home around 1:30 am on August 14. According to police records, he then watched television, texted Katelyn “Good Morning” around 4 am, and then went to sleep. However, he claimed he became concerned when she didn’t reply for hours, prompting him to check her house, where he couldn’t find her, as per the reports.
Reports indicate that during the interview, investigators observed scratches on the left side of John’s neck. When questioned, he initially claimed he sustained those injuries while shaving, but later insisted that he had no idea how he got those injuries. However, there was no concrete evidence suggesting that he was responsible for her death. When digital forensic experts reviewed Katelyn’s cellphone records, they discovered that she had last texted John at around 11:36 pm on August 13, and her phone became inactive shortly after midnight. The police affidavit states that his phone records showed that some of the texts from that day were deleted. The case eventually went cold until 2020, when it was reinvestigated.
As per court records, detectives learned from Katelyn’s friend that the 21-year-old had allegedly said she was unhappy in her relationship and was reconsidering her decision to move to Colorado in the months leading up to her disappearance. Two other witnesses told officials that around 2 am on August 14, 2011, when they were sneaking out of their mother’s house, they saw two vehicles, including John’s red Ford Focus, near Katelyn’s home. Upon searching John’s former home, authorities found landscaping material that was similar to that used to wrap some of her skeletal remains. One of his friends, Jonathan Palmerton, was arrested and indicted on the charge of third-degree felony perjury in February 2023. John was arrested on March 22, 2023, and charged with two felony counts of murder.
John Carter is Serving His Sentence at an Ohio Prison Today
After Jonathan was indicted on a third-degree felony perjury charge for allegedly making a false statement under oath during the April 2022 investigation, he pleaded not guilty. His trial was set to begin on August 7, 2023, but that changed in May 2023, when the prosecution asked the court to temporarily dismiss the charge. They wanted to call Jonathan as a witness against John during John’s upcoming trial. The judge then dismissed the perjury charge against Jonathan. However, the prosecution had also mentioned at the time that they wanted to re-indict him after John’s trial.
As of writing, no further reports suggest that Jonathan has been re-indicted. Eventually, John avoided a jury trial after he entered a plea agreement with the prosecution. On June 7, 2024, he pleaded guilty to the lesser charge of involuntary manslaughter. As per the agreement, the prosecution dropped the two murder charges against John. He was sentenced to 3 years in prison on July 18, 2024. Moreover, he received 14 days of credit for the time he had already served. The judge also ordered him to serve 3 years of post-release control upon completing his prison term.
In October 2025, the defense filed a motion seeking John’s early release before completing the 3-year prison term. However, on January 9, 2026, the judge denied the request, characterizing the defense’s stance by stating: “We don’t get to hit a reset button. We don’t get to undo what’s been done. Boy, I’m a great guy, other than that day that I killed someone.” John is currently incarcerated at the North Central Correctional Institution in Marion, Ohio. In May 2026, he was denied parole during his parole hearing. As of writing, his expected release date is May 15, 2027.
