Former Colorado Republican party chairman Steve Curtis, 57, has been charged with voter fraud and forgery, prosecutors say.

Curtis, an AM radio talk show host, appeared Tuesday in Weld County District Court, where he was advised that he faces two counts in the case: forgery, a Class 5 felony, and misdemeanor voter fraud.

Weld County District Attorney’s spokesman Tyler Hill confirmed the charges, but said he couldn’t discuss details of the allegations, which were first reported by KDVR-Channel 31.

However a criminal complaint filed Feb. 1 says the forgery charge stems from “intent to defraud” a woman on the 2016 general election mail-in ballot. The complaint says Curtis lives in Aurora.

Hill said Curtis is due back in court on May 19.

The case stems from an investigation by the district attorney’s office, Hill said, following a probe by the Weld County clerk.

“We’re typically always the one who does the investigation on this type of case,” Hill said.

“We won’t be commenting through the proceedings,” said Christopher Gregory, Curtis’ attorney, when reached by phone on Tuesday evening.

Curtis was the state’s GOP chairman in the late 1990s. He is host of “Wake Up!” with Steve Curtis on radio station 560AM, KLZ The Source, according to the broadcaster’s website.

A station representative could not immediately be reached on Tuesday.