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Ogden • Kyson Cleary lived for only two weeks of life before he suffered "devastatingly severe" head injuries likely caused by a caretaker, a Primary Children's Hospital doctor testified Friday.

"These are the worst injuries I've ever seen in an infant this age," Antoinette Laskey testified. "Ever."

Laskey's testimony came during a preliminary hearing for the infant's father, 21-year-old Krystopher Mikehal Cleary, who is facing a charge of first-degree felony murder in Kyson Cleary's December 2015 death.

After Kyson was brought to the hospital for treatment in the early morning hours on Dec. 16, Laskey said that doctors observed traumatic injuries: the child's brain was swollen, there were tears in his brain tissue, his collarbone was broken and his eyes were also severely injured.

"There was no part of his brain that was normal," Laskey testified. "… There was no normal part of his eyes."

The child died four days later. Assistant medical examiner Julie Schrader testified Friday in 2nd District Court that she ruled the child's cause of death was "inflicted trauma" and certified the death as a homicide.

Laskey said the injuries were so severe, Kyson would have shown symptoms immediately, such as trouble breathing or seizures.

Prosecutors allege that it was Cleary who caused the fatal injuries to his child.

"The defendant was the only person with the baby when the injuries occurred," Weber County Attorney Chris Allred told a judge on Friday.

After testimony from several witnesses, Judge Joseph Bean ruled there was probable cause for the case to move forward to trial. Cleary pleaded not guilty to the crime and a June 9 scheduling hearing was set.

Pleasant Grove Detective Stetson Talbot testified Friday that Cleary told him that around 2 a.m. on Dec. 16, his wife was in the bathroom and had asked Cleary to care for their crying child.

Cleary told the detective that when he went to change Kyson's diaper, the infant "turned purple and stopped breathing."

"[He said] he had not done anything to Kyson," Talbot testified. "He would never hurt his baby and that nothing happened that night that could account for the injuries."

Talbot said Cleary later told police that he heard the child's clavicle bone "pop" when he was taking off the child's onesie, but had no other explanation for the severe injuries.

Cleary is being held at the Weber County jail in lieu of $250,000 bail. If convicted as charged, he faces a maximum penalty of up to life in prison.