A Utah grand jury has indicted Wasatch County Sheriff Jared Rigby and a former sheriff on obstruction of justice charges, alleging they interfered with the prosecution of Kouri Richins, who was convicted of poisoning her husband.

Rigby and former Summit County Sheriff Dave Edmunds have pleaded not guilty in state court to the second-degree felony. Rigby — who lost his reelection bid in the June primary, but remains sheriff until January — was also charged with a misdemeanor count of making a false statement, to which he also has pleaded not guilty.

The specific allegations against the two men were redacted in publicly available charging records. Third District Judge Richard Mrazik has set a court hearing for Wednesday, Nov. 4, to consider whether the charging document can be publicly released. (Mrazik is the same judge who presided over Richins’ trial, and who sentenced Richins to spend the rest of her life in prison.)

According to KPCW, the obstruction-of-justice investigation centered around an anonymous letter that prosecutors in the Richins case received weeks before Richins’ February trial. The letter contained allegations related to the lead detective on the case, Eric Mainord.

A motion filed by Rigby’s attorney indicates that the charges accuse Rigby of sending the anonymous letter, which allegedly contained false information.

Mainord had filed to run against Rigby in the Republican primary for the sheriff’s job — though he dropped out of the race in May. Rigby ultimately lost in the June primary election to Jeremy Hales, the Wasatch County emergency manager.

Prosecutors have said that Rigby sought to discredit Mainord, according to KPCW, and had help from Edmunds and other top law enforcement officials. Edmunds was the Summit County sheriff from 2003 to 2014.

Richins’ attorneys recently asked to pause her attempts to file a motion for a new trial in the aggravated murder case, saying they wanted to wait until the obstruction-of-justice investigation was complete. Mrazik denied that request.