Michael Anthony Arvallo, 49, was killed on the night of September 15, 2011, on the westbound lanes of Interstate 10 near 51st Avenue in Phoenix. His truck crashed into the median at about 10:30 p.m.; first responders found he had sustained a gunshot wound. Investigators concluded the shooting caused the collision rather than the crash causing the death.

Phoenix police detectives shut down a large portion of the freeway that night to search for evidence, but no suspect description or suspect vehicle was released and the motive remains unknown. Authorities asked the public for information in the days after the killing, and there have been no public announcements of an arrest or identification of suspects since then.

Anyone who was on or near westbound I-10 around 51st Avenue that night, or who has information about Michael Arvallo’s death, is asked to come forward with tips that could help resolve this unsolved homicide.