The shooting injured several people and killed 22-year-old Jared Martinez.
Maestas-Reza was arrested on an unrelated juvenile parole violation on Feb. 22 and placed at the Grand Mesa Youth Services Center.
During his incarceration, GJPD detectives continued to work on the homicide investigation and obtained an arrest warrant on Wednesday.
He was remanded to the Mesa County Detention Facility and is accused of first-degree murder along with additional charges.
The warrant in this case has been sealed and no further details are available for release, the police department said.
According to initial information released after the shooting occurred, officers believed it to be a targeted incident.
With Joe Biden set to become the 46th President of the United States next week, law enforcement agencies across the state and country are preparing for what could be a