José Díaz-Balart

But David's defense attorney, Jane Weintraub, argued in pretrial hearings that the state could not prove her client killed his wife.

She said the lens was so covered in paint it was impossible to make out a reflective vest or a suitcase.

Agent Montilla disagrees.

Still, this was a no-body case, and the evidence was circumstantial.

Until two months before the trial, when the prosecution received a delayed analysis of a speck of DNA police found on the front doorknob of Ana's apartment.

It was David's.

The DNA results arrived on a Wednesday.

On Sunday, David met with his lawyers.

The next day, Agent Montilla received some disturbing news.

Jail guards had found David's lifeless body in his cell.

His manner of death?

Suicide.

Do you think in a way that was his confession?

And I keep thinking, why would she open the door?

David's death did not end the case for the authorities.

The FBI has offered a $25,000 reward for any information leading to the location of Ana's body, and the Spanish National Police continue to search for her.

I want to make it clear to her family and friends that we haven't forgotten about Ana and that we're going to keep looking for her.

With every day that goes by, it can be more difficult to find her, but it will never be because we stop trying to find her.

Whether they do or not, Elisa says that Ana's wonderful spirit will always remain.

The trauma of losing her, she says, can never diminish the beautiful memories of Ana's generosity, her kindness, and the happiness she found in Madrid.