When Galveston Deputies Greg Hayes and Jimmy Gillaine first came to a small island in the Intracoastal Waterway, they made several promises while standing watch over a little girl found dead inside a plastic box.

“The first sights we saw really were tough to handle,” said Hayes.

They promised they would find her real name and find out who killed her. And they said they would come back to put her name on a memorial cross.

"BABY GRACE"

WARNING: GRAPHIC CONTENT Probable cause documents, Part 1 | Part 2

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On Thursday, they kept that final promise, replacing the name of "Baby Grace" with "Riley Ann Sawyers." They glued her pictures in place, along with an Elmo purse, and solar lights to keep the cross lit at night.

“She is a part of us and she always will be,” said Hayes.

Their promise to find who killed Riley Ann has her mom and stepfather pointing fingers at each other from jail.

Kimberly Trenor, her mother, is pregnant again.

“The brutality of the whole thing, it was Zeigler doing it,” her attorney said. “The throwing. It was all him.”

Her attorney also claimed it was Royce Zeigler who devised and carried out the plan to dispose of the body in Galveston Bay two months after Riley died.

“She's a precious baby girl and I think that says it all,” said Cheryl Lawless of Texas Equusearch. “How could they? Why did they? We may never know those answers. It's sickening."

And the deputies who spent those first four hours on the island with Riley Sawyers also plan to keep one last promise they made. They will be the ones who take Riley home.

She will be buried in Ohio, but the cross will stay as a monument to the promises the deputies made.

"We had to bring this to an end and speaking for myself, with the Good Lord's help we did,” said Sgt. Mike Barry.