On the morning of November 1, 2015, a Halloween party near 67th Avenue and Van Buren Street in Phoenix turned deadly when a fight broke out in a crowd of as many as 500 people and gunfire erupted. Twenty-four-year-old Rigoberto Andaloza was fatally shot; another person was wounded and expected to survive.

Andaloza’s mother, Rosa, and sister, Sahira, made a public plea for information at a Phoenix police news conference, saying Rigoberto had a job, was planning to marry, and was not someone who usually attended parties. Investigators reviewed cellphone video from the event that appeared to show a person holding a gun, but that footage did not produce actionable leads. No suspects have been publicly identified or arrested.

If anyone at that Halloween gathering has photos, video, or any detail — however small — that could help the investigation, please contact Silent Witness. Who was at the party and might have seen something useful?