Authorities said Monday they were "fairly confident" that a child whose body was found on the shore of Galveston Bay last month was the 2-year-old daughter of a woman arrested during the weekend with her male companion. Authorities are awaiting DNA test results but believe the girl, who had been known only as Baby Grace since her body was found, is 2-year-old Riley Ann Sawyers of Spring, Galveston County sheriff's Maj. Ray Tuttoilmondo said at a news conference Monday. "It was a few weeks ago I held up this little shoe and asked 'Who is Baby Grace? Who does this belong to,'" Tuttoilmondo said. "We're now fairly confident we know the answer to that."

Tuttoilmondo declined to discuss specifics because the investigation is still under way.

"There is a whole lot more work to do," he said.

The girl's body was found in a plastic storage bin that washed ashore on Oct. 29.

Riley's mother, Kimberly Dawn Trenor, 19, and Royce Clyde Zeigler II, 24, were arrested early Saturday and charged with injury to a child and tampering with evidence, Tuttoilmondo said. Bail was set at $350,000 each.They were charged even though authorities didn't know definitively what happened to Riley.

They reportedly told relatives that someone claiming to be a social worker from Ohio, where Riley's father lives, took the girl in July, but Trenor never told police she was missing, Tuttoilmondo said.

It's unclear whether they are married, Tuttoilmondo said.

The two have attorneys, but Tuttoilmondo could not provide their names.

Riley's paternal grandmother, Sheryl Sawyers, had called Texas authorities after learning of Baby Grace to see if a missing-person report had been filed in Riley's case. When she saw a sketch of Baby Grace, she thought it might be her granddaughter, authorities said.

Sheryl Sawyers said she has not seen Riley since Trenor moved with the girl to Spring, 75 miles north of Galveston, this year to be with Zeigler, whom she met online, the Galveston County Daily News reported Sunday.

Written By JUAN A. LOZANO