Michael Edward Rivas, 51, died after being shot in Pueblo, Colorado, in the early hours of a Sunday morning. He was taken to a local hospital with a serious gunshot wound and was later pronounced dead; the case was reported as the city’s first homicide of the year.

Pueblo police detectives say the shooting happened in an alley on the north side of the city. Investigators identified a suspect, Daniel Montes, who was already in the Pueblo County Jail on unrelated charges. The relationship between Rivas and Montes and any motive have not been released. The investigation remains ongoing as authorities work to reconstruct the events that led to the fatal shooting.

If anyone saw activity in the north-side alley that night or has information about Rivas’s movements or acquaintances, please come forward.