Robert Robertson

Did you have any particular feeling toward him at that moment?

The heart of the prosecution's case was expert medical testimony.

Dr. Janet Squires, the pediatric specialist in Dallas, told the jury Nikki suffered bleeding behind her eyes and on her brain, which was swollen.

Three symptoms that were classic signs of shaken baby syndrome.

Then came the medical examiner, Dr. Jill Urban.

She testified that she'd observed multiple impacts on Nikki and that her injuries were consistent with blows to the head or shaking.

And prosecutors had a surprising witness, Teddy Cox, Robert's girlfriend at the time, the woman in the wheelchair with Nikki on her lap.

The totality of the evidence at the original trial, post-writs that have been filed, and the hearings that have been held.

She testified that she'd seen Robert lose his temper with Nikki before.

She'd seen him spank her and once even saw him shake Nikki.

Teddy's 10-year-old daughter said she'd seen Robert shake Nikki about 10 different times.

The prosecutors asked her to shake a teddy bear the same way she'd seen Robert shake Nikki.

Robert's lawyer knew it wasn't looking good.

Were you keeping a close eye on the jurors?

But that was the least of his worries.

On top of murder, Robert was facing another charge.

One of the nurses who examined Nikki in the hospital told the jury she believed Nikki had been the victim of a sexual assault.

But midway through the trial, prosecutors ended up dropping the charge.

Robert's lawyer thought the explosive allegation was prejudicial, and the trial should have ended right there.

Why was that not grounds for a mistrial?