Branden Harms is said to have watched his girlfriend's baby for a few hours earlier this month.
What happened over that span is unclear.
But one thing is certain.
Just over a day later, the child was dead — and Harms has been arrested under suspicion that he was responsible.
Harms's Facebook page identifies him as a native of Deltona, Florida, who's now living in Colorado. Many of his recent posts find him touting various dietary supplements, and one from February says that he is repping a clothing company called Gym Monkee.
However, his occupation is listed on his LinkedIn page as "Cavalry Scout at US Army."
He came to the attention of the Fountain Police Department around 2:30 a.m. on April 18.
That's when officers called to Memorial Hospital in Colorado Springs were alerted about a four-month-old female infant whose injures were thought to have resulted from child abuse.
The mother of the baby told investigators that Harms, her boyfriend, had been keeping an eye on the baby while she had to be away from her house for a few hours.
Upon her return, "she immediately noticed her baby needed medical attention," the FPD notes.
Thus far, the types of injuries the girl sustained are not being shared. But her condition was serious enough that she was transferred to Children's Hospital in Denver for more specialized care. Unfortunately, she didn't respond to treatment — and she was pronounced dead on April 19.
Two days later, Harms was arrested on suspicion of first-degree murder involving a child under twelve by someone in a position of trust, as well as child abuse resulting in death. At last report, he remained in custody at the El Paso County Criminal Justice Center.
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Look below to see Harms's booking photo.