Colorado state Representative Ryan Armagost resigned from the state Legislature Thursday, earlier than the September resignation he originally planned.

He notified the House clerk on Thursday afternoon. House Republicans announced it shortly after.

“Please accept this letter as formal notice of my resignation from the Colorado House of Representatives, effective immediately,” the Berthoud Republican wrote.

He did not provide a reason for the immediate resignation, but House Democratic leadership announced earlier in the day that they planned to censure Armagost for taking a photo of a Democratic representative and sending it to an internal Republican group chat in April, as reported by Colorado Public Radio. In that group chat, Republican members compared the Democratic lawmaker, Representative Yara Zokaie of Fort Collins to a prostitute because of her clothing. The photo became the center of social media harassment against Zokaie.

House GOP spokesperson Laurel Boyle gave no further comment on Armagost’s resignation.

Armagost had already planned to leave the Legislature in September to take a job in Arizona. He was excused from the chamber Thursday.