Prosecutors have until Thursday to file formal charges.
Tinsley's body was found in a ditch, about 20 miles from her Fort Wayne neighborhood, three days after she disappeared in April 1988.
On April 4, her body was found by a jogger in a ditch in DeKalb County, near Spencerville. But two years later, a message scrawled in pencil or crayon appeared on a barn door not far from where her body was found, the Federal Bureau of Investigation said. "Who's got her?" Tinsley's mother, Janet Tinsley, told Crime Watch Daily in 2016. She took about 10 minutes to die, and then he allegedly had sex with the corpse. The forensic exam also found DNA from an unknown male person in the girl's underwear, the affidavit said. Calls on Monday to the prosecutor's office were not immediately returned. He is slated to make his first court appearance Monday.
But finally, after 30 years of searching for answers, investigators experienced a significant break in the case. Police have scheduled a press conference for Tuesday.
On May 21, 1990, police were called to a barn at Schwartz Road and IN 37, where writing had been seen on the barn that appeared to show the suspected killer taking credit for killing Tinsley.
In 2004, investigators had a short-lived breakthrough: The unidentified killer began leaving handwritten notes, photographs of his body, and used condoms in various locations. Miller then allegedly confessed kidnapping Tinsley and bringing her to his home where he raped, strangled and killed the girl.
On May 11 of this year, Fort Wayne Police Det.
In May 2018, officers contacted Parabon Nanolabs to come up with a genetic profile of the suspect.
That led police to a trailer park in Grabill, Indiana, where they found used condoms in a garbage outside Miller's home. Authorities used a public DNA database to identify him as a suspect.
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In May, Moore's research led to the arrest of a man in Washington State in connection with 1987 double murder there, news reports said.
The cold case is one of several that have been solved in recent months because of advances in genealogy and DNA technology.
John Miller, 59, of Grabill, was arrested Sunday morning by Fort Wayne police and ISP after he reportedly admitted to the murder to detectives. Police said the DNA extracted from the condoms was consistent with the DNA found in the condoms in 2004 and the DNA recovered in Tinsley's underwear in 1988, according to the affidavit.
Earlier today, Fort Wayne Police Det.
Sunday morning, Martin and a state police detective approached Miller outside his mobile home.
The suspect told police he disposed of her body in a ditch the following day.
Police and her family fanned out that Friday afternoon in April 1988, searching through the weekend, but there was no sign of her.
Miller has allegedly confessed to raping the child and choking her to death in his trailer before sodomizing her body. One of Tinsley's shoes was found 1,000 feet from where she was located, according to court documents.