A Pekin woman faces up to 13 years in prison for her role in selling synthetic marijuana that sickened numerous people last spring.

Rachel Spires, 30, will be sentenced on Jan. 11 following her guilty plea Thursday to possessing more than 2,000 grams of leafy material laced with FUB-AMB, an illegal chemical compound found in the drug commonly known as K-2.

Her arrest came after police learned that UnityPoint Health — Pekin hospital had treated an undisclosed number of people for poisonous overdoses of the substance in early April.

Spires’ boyfriend, Richard Booth, 26, also is charged in the case and remains in custody pending his next court appearance on Nov. 26.

One of the sickened patients told police that Spires was the source of the drug, court documents stated. Spires’ mother said Spires had asked her to hold $1,000 for her and that she saw multiple packets of synthetic marijuana in Spires’ home.

A search warrant for the residence at 223 Sunnyridge Court, where Booth also lived, revealed more than 2,000 grams of K-2, $6,000 in cash and 435 bags of the drug packaged for delivery, the documents stated.

Spires also pleaded guilty to aggravated battery for causing injury with the drug. A prosecutor agreed to a 13-year sentence cap, instead of the case’s 30-year maximum, in exchange for her pleas.

The couple’s charges were filed in the same week that another Pekin man was charged with the drug-induced homicide of a man who died of internal bleeding after ingesting K-2.

Lonnie Smith, 36, allegedly sold the K-2 attributed to the death of Anthony Phillips of Pekin on April 9. He and his girlfriend were hospitalized two days earlier with bleeding that in Phillips’ case killed him.

It’s not yet been revealed in court whether Smith’s case is related to those against Spires and Booth.