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A woman was arrested Saturday in connection with human remains found stuffed in garbage bags on the side of Michigan roads, police said.

The 59-year-old woman from St. Clair, Mich., was arrested and in police custody waiting to be arraigned, according to NBC affiliate WDIV. Police did not immediately identify her.

A Friday autopsy and evidence obtained from the remains revealed that the body parts were those of a missing 32-year-old St. Clair Shores man. His identity has not been released.

Police at the scene where one of the bags containing body parts was found in St. Clair County, Mich.WDIV

The St. Clair County Sheriff's Office got a call on Thursday afternoon about a “suspicious incident” on a highway and adjoining road in rural Michigan, near the Canadian border, according to St. Clair County Sheriff Tim Donnellon.

When deputies responded, they found body parts in garbage bags and spoke to a resident — not the original caller — who told them she saw garbage bags thrown from a mid-1990s-model white SUV, Donnellon said. The witness told investigators a “heavy-set middle aged white female” was in the driver’s seat.

Late Friday, St. Clair County Sheriff's Office released gas station surveillance video screenshots of a suspect and her light-colored SUV, and asked for tips from the public.

“We are treating this incident as a homicide,” Donnellon said.

On Friday, a third resident led investigators to another bag full of clothing and burnt documents.