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DENVER — A man has been arrested and charged in connection to a shooting that left three people dead at a south Denver light rail station last month.

Maurice Butler, 38, was arrested Thursday. He is charged with three counts of first-degree murder, according to court records.

Butler had previously been arrested on Aug. 13 for investigation of unlawful possession of a controlled substance and a parole violation, and has remained in custody since.

On Aug. 9, a passerby found the bodies of two men and one woman just north of the Interstate 25 and South Broadway light rail station at South Broadway and Ohio Avenue.

The Denver Office of the Medical Examiner said Christopher Zamudio, 45, Nicole Boston, 28, and Jerome Coronado, 39, died from gunshot wounds.

Police said they could not discuss a motive because the investigation is ongoing.

At least two of the victims and Butler were known to each other and police said it was not a random incident.