Cindi Arleen Estrada. Reconstruction by Carl Koppelman
One day after genetic genealogy finally identified I-90 Jane Doe (1992), her alleged murderer— suspected serial killer Clark Perry Baldwin—died in prison from a heart attack.
Baldwin was arrested on May 6, 2020, for the 1991 murder of Pamela McCall, who was about 5 months pregnant at the time. In May 2025, Baldwin was convicted and sentenced to life in prison in Tennessee. He was then going to stand trial in Wyoming for the murders of two unknown women—Bitter Creek Betty and I-90 Jane Doe.
Bitter Creek Betty was identified as Irene Vasquez in May 2022, although the identification was not made public until May 2025. Then, on July 17, 2025, investigators with the Wyoming Division of Criminal Investigation announced they identified I-90 Jane Doe as Cindi Arleen Estrada.
Baldwin died the next day after suffering a heart attack in prison two days prior.
Wyoming murders
On March 1, 1992, a truck driver spotted the body of a woman laying face down in the snow at a rest area known as Bitter Creek, on the westbound side of I-80 and 40 miles east of Rock Springs, Wyoming. The woman’s body was frozen and she had no clothing on; however, a pair of underwear and sweatpants were found nearby. No other clothing was ever recovered. The medical examiner noted signs of strangulation, trauma to the face and jaw, and sexual assault to both lower body cavities. Investigators believe she may have been killed elsewhere and that her body was later left at the location between October 1991 and February 1992.
Just over a month later, investigators were called to a different highway—the west side of I-90, approximately five miles south of the Wyoming/Montana border. Here, they recovered an unknown woman’s body from a ditch. She was found fully clothed, except for her socks and shoes. The woman was found to be about three months pregnant at the time of her death.
Both cases quickly went cold amid growing concern of a serial killer operating in the time frame across the states of Wyoming, Utah, Nevada and Idaho.
Tennessee murder
Still, investigations persisted and a significant breakthrough occurred in 2012 when a male DNA profile found on evidence related to the I-90 Jane Doe case was matched to a male DNA profile developed from evidence in the Bitter Creek Betty investigation—conclusively linking the two Wyoming homicides to the same unknown suspect.
Then, in 2019, that unknown male DNA profile was linked to DNA left during the rape and murder of Pamela McCall in Tennessee. McCall’s body was found on March 10, 1991, on the side of I-65 in Spring Hill, Tennessee, about 30 miles south of Nashville. The 32-year-old was about 10 weeks pregnant when she was raped and strangled to death. Upon recovering her body, investigators found traces of seminal fluid on her pantyhose. Years later, this DNA was isolated and found to match DNA left at the crime scenes of both I-90 Jane Doe and Bitter Creek Betty.
The DNA from the pantyhose was also given to investigators to conduct investigative genetic genealogy techniques in the hopes of uncovering new information. Ultimately, multiple leads identified Clark Perry Baldwin as the unknown DNA contributor.
Baldwin was a long-haul trucker operating in Wyoming, Tennessee and other nearby states in the early 1990s.
Iowa arrest
Baldwin was arrested at him home on May 6, 2020 in Iowa after FBI agents retrieved his DNA from a shopping cart and trash—and subsequently confirmed the DNA match to the previously unknown profile from all three crime scenes.
Controversially, it took five years for Baldwin to stand trials in Tennessee for the murder of McCall and her fetus. But in May 2025, he was sentenced to life in prison, with the expectation he was going to be extradited to Wyoming to face charges for the murders of Vasquez (whose identity was known) and Estrada (whose identify was still unknown at the time). That extradition never got the chance to unfold.
How many more?
In February 1991, Baldwin was arrested on charges of raping a hitchhiker in Texas. At gunpoint, Baldwin struck her over the head and then bound her mouth, and legs, raped her and attempted to strangle her, but the victim was able to free herself from her restraints and escape. During the investigation, Baldwin confessed to the assault, but the charge was dismissed due to failure to prosecute.
Additionally, Iowa State Police say Baldwin is a suspect in the murder of Rhonda Knutson, whose body was found at a truck stop near Williamstown, Iowa—a short distance from where Baldwin was living at the time.
Knutson was beaten to death at her workplace during the night shift. She suffered severe blunt force trauma but was not raped. A co-worker discovered her body in the back room of the store where they worked. According to him, shortly before the murder, two truck drivers entered the store, one of whom was allegedly her killer. Based on the witness' testimony, police compiled sketches of the two suspects, which were posted at approximately 1,500 truck stops across multiple states. Baldwin matched the sketch, but he did not admit his involvement in the girl's murder after his arrest or prior to his death.
After Baldwin’s arrest in 2020, his ex-wife told police he had repeatedly mentioned strangling a girl in the 1990s in a western state and throwing her body out of his truck near an interstate highway.