Zeroing in on Jeff
Assuming Shaken Baby
At the hospital, doctors could see that Gracelynn was well-card for: she had no broken bones, no grip marks, and no obvious bruising or other marks anywhere on her body. At her autopsy, the pathologist would find than a small bruise under her hair near her temple, but it was insignificant enough that no one noticed it until then.
She was given a CT scan and, later, an MRI. The medical findings were that she had very small old and new subdural hematomas (blood in the space above her brain). Doctors also saw retinal hemorrhaging (blood spots) in her eyes.
These are two medical findings of a "triad" that from the 1960s to the 2000s made up the bedrock theory of Shaken Baby Syndrome. The third finding is encephalopathy, or brain swelling.
The SBS theory had long been that if "the triad" was present, then the only cause could be violent shaking.
That theory grew from a hypothesis in the 1960s, and it has never been proven by the scientific method or reliable evidence. Recent evidence casts serious doubt on its underpinnings, as explained in the Abusive Head Trauma/Shaken Baby Syndrome page.
Regardless, in 2010, police in Boise, together with local prosecutors and medical professionals, assumed the worst.
They were still working off of old science that non-accidental trauma must have been the only cause for Gracelynn's medical findings and that it resulted in an immediate collapse of the child in Jeff's care.
Based on this, the power of the State zeroed in on Jeff because he was the last person with Gracelynn.
He was charged with the murder of his daughter.