Gretchen Swinn

But he could never shake the memory of what happened to Robert, so he invited Gretchen in.

They talked for hours.

Brian opened up about what had been haunting him, that sexual assault allegation made against Robert.

The nurse, who declined to speak with us, told Brian she believed Nikki was a victim of sexual assault.

So he sent evidence from Robert's home out for testing.

We sent all the bed sheets, everything.

There was no DNA evidence, nothing to support that.

Both the pediatric specialist who examined Nikki and the medical examiner who conducted the autopsy found no evidence either.

Yet prosecutors charged Robert with sexual assault anyway.

On direct testimony at Robert's 2003 trial, the nurse said that she was a certified SANE nurse, a sexual assault nurse examiner.

But when asked about that on cross-examination, she said, I am not actually certified.

In the trial transcripts, the words sexual assault appear more than 80 times.

But before closing arguments, prosecutors dropped the charge.

Too late, Brian said.

The damage was done.

Gretchen told Brian that since Robert's conviction, the certainty of shaken baby science had collapsed.

How did the new evidence regarding shaken baby syndrome affect your overall feeling toward the case?

Gretchen told Brian about Nikki's medical history, that she'd seen doctors more than 40 times in her short life and was terribly ill the week she died.

Nikki was a very ill child.

Did you have a chance to look into her medical history before arresting Robert?