Jamal Dion Patterson, 24, of Pasadena, California, was critically wounded in a shooting the night of October 25, 2021, in the 1000 block of Summit Avenue. He and another 24-year-old man were driven to a local hospital by private car; Patterson died three days later on October 28, 2021. The Los Angeles County Medical Examiner‑Coroner ruled the cause of death a gunshot wound to the head and ruled the death a homicide.

The Pasadena Police Department identified and arrested multiple suspects in the case. On December 13, 2021, authorities announced arrests of Cecilio Hernandez, 24, of Pasadena; Angel Martinez, 40, of Phelan; and an unnamed 16-year-old male juvenile from Pasadena. Hernandez was charged with one felony count of homicide, one felony count of attempted homicide, and one felony count of a felon in possession of a firearm, with bail set at $5.1 million. Martinez faced six counts related to unlawful possession of firearms and ammunition, with bail at $1.1 million. The juvenile was charged with one felony count of homicide and one felony count of attempted homicide and held without bail.

Investigators linked the suspects to a local criminal street gang and said the shooting occurred amid a surge of gun violence in Northwest Pasadena. Search warrants executed in Los Angeles and San Bernardino counties reportedly yielded three rifles, five handguns, body armor, ammunition, and other items described as evidentiary.

Did anyone in Pasadena have information about Jamal Patterson or the events on Summit Avenue that night?