INDIANAPOLIS -- An Indiana father said he still holds out hope that the daughter who was taken from him more than 20 years ago will some day come home.

Mike Sherrill told 6News' Renee Jameson that he has been watching closely the developments in the California case of a woman found 18 years after she was kidnapped.

Police said Jaycee Lee Dugard was taken in 1991 when she was 11 years old and kept in the backyard of Phillip and Nancy Garrido.

Here in Indiana, Shannon Sherrill, 6, was last seen playing outside her mother's mobile home in Thorntown in October 1986.

"You never forget. Somewhere out there I have a little girl," Sherrill said.

While he said he is encouraged by the California case, Sherrill said he is frustrated that a state police investigation was turned over to the Boone County prosecutor in 2007, but no charges have been filed.

Lt. Jeff Heck, who is now retired from the Indiana State Police, said he centered his investigation on a tip from an informant, and turned over the information, including the person's name, to the prosecutor.

Prosecutor Todd Meyer was not available for an interview on Friday.

Mike Sherrill said he is confident his little girl is out there somewhere.

"Oh no, I've never given up hope," he said. "Someday we'll find her, or she'll find me."

In 2003, Kansas resident Donna Walker claimed to be Shannon Sherrill, but it was later determined to be a hoax. She was sentenced to 18 months in prison after pleading guilty to impersonating the girl.

Meyer's receptionist said the prosecutor would return Jameson's call on Monday.