Emporia is in Lyon County, about 50 miles southwest of the rural Ottawa farm in Franklin County where the four killings took place. Osage County, where Lana's body was found, lies between the two.
Authorities have been reluctant to discuss details of the case, and on Sunday, Richards declined to say where or how the girl's body was found. He said the Franklin County attorney's office has taken over the case.
Franklin County Attorney Stephen Hunting said Friday that a gun was used against the victims at the farm, but he declined to say whether they had been shot. Authorities haven't said what the motive for the killings may have been.
Flack was expected to appear in court early next week.