PEORIA, Ill. (AP) – Human bones and other remains were unearthed Friday at sites where a former concrete worker told authorities he buried four of eight women he had killed, prosecutors said.

Among the remains were “sizable bones” and skull parts found near the home of the accused serial killer’s grandmother in Bellevue, just west of Peoria, said Peoria County State’s Attorney Kevin Lyons.

Larry Bright, 38, was charged Thursday with murdering one woman. Prosecutors say he confessed to killing seven others as well.

The bodies of four victims had turned up along rural roads around Peoria since the summer of 2003. But the four others, all reported missing in the past year, had never been found.

Prosecutors now believe Bright burned those bodies in pits near the converted garage where he lived behind his mother’s house in rural Peoria, then crushed the bones and scattered the remains. Bright has been jailed since December on a separate charge.

Remains are being sent to the FBI for testing, and results could be available within a month, Peoria County Chief Deputy Joe Needham said.

Lyons said he expects a grand jury to issue indictments in the killings before Bright’s next scheduled court appearance on Feb. 24.

Bright did not yet have a lawyer assigned Friday.