GALVESTON, Texas—Two years after the remains of a toddler who came to be known as “Baby Grace” were dumped in Galveston Bay, the child’s stepfather was convicted of capital murder in her beating death.

The remains of Riley Ann Sawyer—weighing 12 pounds and stuffed into a plastic container—remained unidentified for nearly a month after they were discovered October 2007. Investigators dubbed the child “Baby Grace.”

Then Sheryl Sawyers of Mentor, Ohio, a Cleveland suburb, saw an artist’s sketch and told Texas police she thought the child might be her missing granddaughter.

“I wish I hadn’t been right,” Sheryl Sawyers said Friday.

Riley’s stepfather, Royce Clyde Zeigler II, was convicted of capital murder Friday and will receive an automatic life sentence without parole.