Cole Finegan on Wednesday announced he’s stepping down as the U.S. attorney for the District of Colorado at the end of the month.

Finegan, who was appointed by President Joe Biden and confirmed by the U.S. Senate, took the oath of office on Dec. 1, 2021. His last day on the job will be May 31.

During his time as U.S. Attorney, Finegan’s office represented the U.S. in criminal and civil court matters in Colorado and the in the U.S. Court of Appeals for the Tenth Circuit.

“I will be forever grateful for the opportunity to serve as the United States Attorney for the District of Colorado,” Finegan said in a new release announcing his resignation. “I am equally thankful to the career attorneys and professional staff who work every day to help keep our citizens safe, to make sure that the rule of law is applied equally, and to protect the civil rights of every citizen. We are fortunate to have these outstanding public servants in our state. Serving the people of Colorado alongside them will always remain one of the most significant experiences of my life.”

Finegan, a former city attorney for Denver, was known for his collaborative approach during his tenure, partnering with state and local law enforcement to prosecute violent criminals, protect civil rights and recover money lost due to fraud.

Finegan also had several high-profile cases under his office’s watch. He secured a life sentence for a drug dealer who distributed fentanyl that killed drug users in 2023. He also earned a conviction of a dentist who murdered his wife while on safari in Zambia, and negotiated a guilty plea on federal hate crimes for the assailant in the mass killings at Club Q in Colorado Springs.