UPDATE 3:21 p.m.:
A news release from Tucson Police said the incident took place in the 8400 block of East Sarnoff Ridge Loop on Tucson's east side.
It said that both Durain and Poppe were arrested on suspicion of first-degree murder and child abuse.
The news release also said that the arrest was made on Wednesday, June 4. The delay was due to the autopsy not being released to investigators until May of 2025, the news release said.
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The death of a 3-month-old infant has resulted in the arrest of the infant's mother and the mother's boyfriend.
According to an interim complaint, 31-year-old Amanda Durain called 911 on Jan. 24, stating that her infant was having trouble breathing and not responding.
Durain's boyfriend, 24-year-old Hunter Poppe, who is not the infant's biological father, got on the phone and said the baby's breathing was labored.
Poppe conducted CPR on the infant until Tucson Fire arrived. The infant was transported to Tucson Medical Center for treatment.
While at TMC, the infant had a CT scan and was found to have multiple brain bleeds of different ages and sizes, the complaint said.
The infant was transported to Banner University Medical Center for a higher level of care, the complaint said.
Banner conducted a full skeletal survey and found the infant had several fractures on different parts of her body.
Durain and Poppe gave different accounts of what happened, the complaint said.
According to Poppe, the complaint said, the infant woke up restless and they thought she had gas. Poppe did bicycle motions with the infant's legs, laid her on her stomach and rubbed his fingers up and down her belly.
The couple tried different things for about 30 minutes to try and help the infant, Poppe said.
The couple eventually went outside to smoke a cigarette while the infant was lying in their bed.
They went back inside when they heard her crying, the complaint said.
Poppe said he started rubbing her stomach and she started crying. She tensed up and her arms were up by her head. The infant then went pale and stopped breathing, Poppe told authorities, and when she did breathe, those breaths were labored. That's when Durain called 911, Poppe said.
In Durain's version of what happened, the infant woke up and both Durain and Poppe walked with her around the room, playing with her, the complaint said.
Durain went to lay the infant in the bassinet on the bed, and the infant fell a few inches into the bassinet as Durain was laying her down.
Durain would not go to sleep, so Poppe picked her up from the bassinet and placed her on the mattress of the bed, Durain told detectives.
The infant fussed, but eventually fell asleep, and the couple went outside. Ten minutes later, according to Durain, the couple heard a squeal. They went back into the room to find the infant unresponsive, pale and no breathing, Durain told detectives.
Poppe could not explain the infant's injuries. He denied any falls, shakes or drops, the complaint said.
Durain did not know how the infant was injured either. She told authorities the exercises they did on her might have caused some of the injuries, but that the baby never looked to be in pain. Durain said a fracture in the infant's leg might also have been from a diaper change, when the infant kicked her leg out.
The infant was evaluated by a Child At Risk Evaluation Team member, who said the injuries discovered in a 2-month-old who is not rolling, crawling or walking are consistent with inflicted injury.
"There are no organic disease processes that cause intracranial bleeding and fractures. Despite the absence of retinal hemorrhages, there is significant concern for abusive head injury," the team member wrote.
The infant died on Jan. 29 from a non-survivable brain injury.
In the autopsy conducted on Feb. 3, the cause of death was determined to be blunt force injuries. The manner of death was determined to be homicide.
Poppe was arrested on suspicion of child abuse and first-degree murder.
