Alex Cox was the brother of Lori Vallow Daybell and a pivotal figure in the complex series of crimes involving the Vallow and Daybell families. As the primary "enforcer" for the group’s extremist religious beliefs, Cox was responsible for the killing of Charles Vallow and was forensically linked to the disposal of Tylee Ryan and Joshua “J.J.” Vallow before his own death in December 2019.
The narrative of Alex Cox is one of the most unsettling components of the "Doomsday Cult" investigation that gripped the United States between 2019 and 2024. While Cox died before he could face trial for the murders of his niece and nephew, his actions served as the physical catalyst for the theological "cleansing" envisioned by Lori Vallow and Chad Daybell. As of 2026, the forensic and testimonial evidence gathered during the trials of his co-conspirators has provided a near-complete picture of Cox’s role as a self-styled religious warrior who carried out several violent acts under the guise of spiritual necessity.
The Family Dynamic and Radicalization
To understand the actions of Alex Cox, one must examine his lifelong relationship with his sister, Lori Vallow. The two shared a bond that many family members and investigators described as intensely close, bordering on codependent. Cox had a history of violent intervention on Lori’s behalf long before the 2019 murders. In 2007, he was sentenced to 90 days in jail for TASERing Lori’s third husband, Joseph Ryan, in an incident that foreshadowed his later actions.
By 2018, when Lori Vallow met Chad Daybell, Cox was quickly integrated into their burgeoning belief system. This ideology categorized individuals as "light" or "dark" and claimed that those possessed by evil spirits became "zombies." According to the group's theology, the only way to free a person’s soul from a "zombie" state was to kill the physical body. Cox was identified within this spiritual framework as a "warrior" who had protected Lori in multiple past lives. This role provided him with a perceived divine mandate to eliminate anyone Lori or Chad deemed a spiritual obstacle.
The Shooting of Charles Vallow (July 2019)
The first major event in the 2019 timeline occurred in Chandler, Arizona. On July 11, 2019, Alex Cox called 911 to report that he had shot Lori’s fourth husband, Charles Vallow, in self-defense. Cox claimed that Charles had attacked him with a baseball bat during an argument and that he had fired his weapon to protect himself.
However, the Chandler Police Department’s subsequent investigation, which was fully detailed during Lori Vallow’s 2024-2025 Arizona legal proceedings, revealed significant discrepancies:
- The Physical Evidence: Forensic analysis of the blood splatter and the trajectory of the bullets suggested that Charles was already on the ground when the second shot was fired.
- The Timeline: Cox waited several minutes to call 911, and bodycam footage showed he was not performing life-saving measures, despite his claims to the contrary.
- The Motive: Communications between Lori, Chad, and Alex revealed a conspiracy to eliminate Charles to facilitate Lori moving to Idaho and to potentially collect a $1 million life insurance policy.
While Cox was not charged at the time of the shooting, he was later named as a co-conspirator in the grand jury indictment against Lori Vallow for the murder of Charles Vallow.
The Disappearance and Murder of the Children
In September 2019, Lori moved her children, 16-year-old Tylee Ryan and 7-year-old J.J. Vallow, to Rexburg, Idaho, to be near Chad Daybell. Alex Cox moved into an adjacent apartment in the same complex. This month marked the final sightings of both children.
The Death of Tylee Ryan
Tylee was last seen on September 8, 2019, during a family trip to Yellowstone National Park. Forensic evidence from Alex Cox’s cell phone placed him at the park with the children that day. More critically, GPS data tracked Cox to Chad Daybell’s property early the following morning, September 9. He remained there for several hours in an area that would later be identified as the "pet cemetery." Tylee’s remains, which had been burned and dismembered, were found in that exact location in June 2020.
The Death of J.J. Vallow
J.J. was last seen on September 22, 2019. Again, cell phone geofencing data was the "smoking gun." On the morning of September 23, Alex Cox’s phone pings placed him in Chad Daybell’s backyard for approximately 17 minutes. This location corresponded exactly with the spot where J.J.’s body—bound in duct tape and plastic—was eventually discovered.
The precision of the GPS data suggests that Cox was the primary person responsible for the physical labor of disposing of the bodies, acting under the direction of Chad Daybell, who was observed in the area during these windows of time.
Attempted Shootings and the Death of Tammy Daybell
Cox’s involvement was not limited to the Vallow family. He was also linked to attacks against the Daybell family and the Boudreaux family.
- Brandon Boudreaux: In October 2019, a shooter in a Jeep Wrangler (registered to the late Charles Vallow) attempted to kill Brandon Boudreaux, the ex-husband of Lori’s niece, Melani Pawlowski. Forensic evidence and vehicle sightings later identified Cox as the likely gunman.
- Tammy Daybell (Attempt): On October 9, 2019, Tammy Daybell (Chad’s wife) reported that a masked man had shot at her with a paintball gun or a muffled firearm in her driveway. Investigators later concluded this was a failed attempt by Alex Cox to murder her.
- Tammy Daybell (Death): Tammy died in her sleep on October 19, 2019. While her death was initially ruled natural, her body was exhumed in December 2019. The subsequent autopsy and trial testimony revealed she had been asphyxiated. Cell phone data placed Cox at a church parking lot near the Daybell residence on the night of her death, suggesting he was on standby or involved in the act.
The Sudden Death of Alex Cox
On December 12, 2019—one day after the news broke that Tammy Daybell’s body was being exhumed—Alex Cox died suddenly in Gilbert, Arizona. He was found by his new wife’s son on the floor of a bathroom, breathless and unresponsive.
The timing of his death sparked immediate conspiracy theories, with many questioning if he had been "silenced" by Lori and Chad or if he had committed suicide. However, the Maricopa County Medical Examiner’s Office conducted an extensive autopsy and toxicology report.
Forensic Findings of the Cox Autopsy
The autopsy concluded that Alex Cox died of natural causes. The specific findings included:
- Bilateral Pulmonary Thromboemboli: Blood clots had traveled to his lungs, a fatal condition often resulting from deep vein thrombosis.
- Hypertensive Cardiovascular Disease: Evidence of long-term high blood pressure that had thickened the walls of his heart.
- Toxicology: No significant poisons or "cult-related" substances were found. While Narcan was found in his system, it was administered by first responders attempting to revive him.
Despite the medical finding of natural causes, the psychological weight of the investigation cannot be ignored. Family members reported that Cox was "distraught" and had expressed concern that he was being set up as the "fall guy" for Lori and Chad’s actions shortly before he collapsed.
Summary of Key Events Involving Alex Cox
| Date | Event | Location | Significance |
|---|---|---|---|
| July 11, 2019 | Shooting of Charles Vallow | Chandler, AZ | Cox claimed self-defense; later ruled a conspiracy to murder. |
| Sept 9, 2019 | Tylee Ryan's Burial | Rexburg, ID | GPS data puts Cox on Daybell property hours after Tylee's disappearance. |
| Sept 23, 2019 | J.J. Vallow's Burial | Rexburg, ID | GPS data puts Cox in Daybell's yard for 17 minutes. |
| Oct 2, 2019 | Brandon Boudreaux Attempt | Gilbert, AZ | Attempted shooting from a vehicle linked to Cox. |
| Oct 9, 2019 | Tammy Daybell Attempt | Salem, ID | Cox identified as the masked gunman who fired at Tammy. |
| Dec 12, 2019 | Alex Cox Dies | Gilbert, AZ | Died of blood clots one day after Tammy Daybell's exhumation. |
| June 9, 2020 | Recovery of Bodies | Rexburg, ID | FBI uses Cox's GPS pings to locate children's remains. |
Posthumous Legal Status and Legacy
Because Alex Cox died before the discovery of the children's bodies, he was never formally tried for the murders. However, he was named as a lead co-conspirator in the trials of Lori Vallow Daybell (convicted in 2023) and Chad Daybell (convicted in 2024).
The prosecution in both cases relied heavily on Cox’s digital footprint. His cell phone was effectively the map that led the FBI to the shallow graves on Chad Daybell’s property. Witnesses, including his widow Zulema Pastenes, testified that Cox performed "spiritual sessions" to cast out demons and believed he was a tool of divine justice.
In the final analysis, Alex Cox serves as a cautionary example of how religious radicalization can be weaponized. He was the "hands" of the operation—the individual who carried out the physical violence that Lori and Chad mandated through their purported visions. By the time of his death, he had been involved in or present for four deaths and two attempted murders in a span of just six months.
Frequently Asked Questions
Was Alex Cox murdered to keep him from talking?
The Maricopa County Medical Examiner officially ruled his death as natural causes due to blood clots (pulmonary embolism). While the timing was highly suspicious—occurring right as the investigation into Tammy Daybell intensified—there is no medical evidence of foul play or poisoning.
Did Alex Cox know where the children were buried?
Yes. Forensic GPS data from his phone placed him at the exact locations where Tylee Ryan and J.J. Vallow were buried on the Daybell property. This data was recorded on the mornings immediately following the children's last known sightings.
Was Alex Cox ever charged with a crime?
Cox was never charged with the murders during his lifetime because the bodies were not found until six months after he died. However, posthumously, he was identified in police reports and court indictments as a primary co-conspirator in the murders of Charles Vallow, Tylee Ryan, and J.J. Vallow.
What was Alex Cox’s relationship with Chad Daybell?
Cox was a devout follower of Daybell’s teachings. He believed Chad was a prophet and that he (Alex) was a protector in a spiritual war. This belief system was used to justify the killings of family members who were labeled as "zombies" or "dark."
Did Alex Cox have a criminal record before 2019?
Yes. In 2007, Alex Cox was involved in an incident where he attacked Lori Vallow's then-husband, Joseph Ryan, with a TASER and threatened to kill him. He served 90 days in jail for this assault.
Practical Recommendation for Further Research
For those seeking to understand the granular details of the forensic evidence against Alex Cox, the most authoritative sources are the trial transcripts from the State of Idaho v. Lori Vallow Daybell and State of Idaho v. Chad Daybell. These records include the full geofencing reports and the testimony of FBI Special Agents who tracked Cox’s movements. Additionally, the Chandler Police Department has released an extensive "Probability Report" regarding the death of Charles Vallow, which provides a minute-by-minute breakdown of Cox’s actions on the day of that shooting.
