The first wife of “Doomsday mom” Lori Vallow Daybell’s husband may have been restrained when she died under mysterious circumstances three years ago, a medical examiner testified this week.

Bruises consistent with being restrained were discovered on the arms and chest of Tammy Daybell, who was married to Lori’s husband Chad Daybell at the time of her death in October 2019, Utah’s Chief Medical Examiner Dr. Erik Christensen testified during Lori’s murder trial on Monday.

The bruises likely occurred around the time she died, and support the finding that her cause of death was asphyxia, or being deprived of oxygen, KSL.com reported.

In the hours before her death, Tammy suffered “acute injuries” that likely caused the contusions, Christensen said.

Pictures of the bruises on the 49-year-old’s body were shown to jurors, while marks of bruises were drawn on a figure that was shown publicly to the courtroom.

Vallow Daybell, 49, is on trial in Idaho for the murders of her children Tylee Ryan, 16, and Joshua “J.J.” Vallow, 7 — and for conspiring with her husband Chad to kill his first wife, who was found dead on Oct. 19, 2019.

Chad Daybell had also been charged in connection with the three deaths and will stand trial at a later date.

Christensen testified Monday that he performed Tammy’s autopsy on Dec. 11, 2019, after her body was exhumed from a cemetery in Springville.

Doctors determined her death is a “diagnosis of exclusion,” or a medical condition reached by a process of elimination.

While a person can die naturally of asphyxia after a seizure of heart arrhythmia, Christensen said both would be unusual for a woman of Tammy Daybell’s age and health.

Chad Daybell told the coroner she had suffered from something like a seizure, but Christensen said there was nothing in her medical records to suggest she had. He also told the coroner she had been coughing and vomiting throughout the night and that her torso and head had fallen off the bed at 5:40 a.m.

The autopsy also revealed that Tammy Daybell had been laying on her back after her death. By the time police arrived her body was cold and stiff, meaning she could have been dead for several hours before Chad Daybell called authorities.

In other testimony Monday, a DNA analyst testified that hair found on a piece of duct tape that was used to wrap 7-year-old J.J.’s body belonged to Vallow Daybell.

“The partial DNA profile matched the DNA profile provided for Lori Vallow Daybell,” DNA analyst Keeley Coleman testified. “The probability of randomly selecting a random individual in relation to that profile in 1 in 71 billion.”

After an exhaustive search that garnered national attention, J.J.’s body was found in June 2020 buried under a tree in Chad Daybell’s backyard. His sister Tylee’s remains were found in an area used as a “pet cemetery” on the Idaho property.

Tylee’s remains had been gnawed on by an animal and hacked with a tool before being burned.

An FBI forensic anthropologist also testified last week that J.J.’s body had stretch marks on his neck and bruises on his wrists and ankles where he was bound with duct tape.

Lori Vallow Daybell and Chad Daybell believe the end times are upon the world and we must prepare for doomsday and the second coming of Christ.

The couple has collected life insurance money and Social Security following the deaths of Vallow Daybell’s children and Daybell’s former wife, prosecutors claim.

Vallow Daybell’s trial entered its fifth week on Monday.