Christian Casillas, 20, was fatally shot the night of September 28, 2016, in the Elmhurst area of East Oakland. The shooting happened about 10 p.m. in the 1900 block of Auseon Avenue while Casillas was in the neighborhood with relatives to pick up another family member. A car drove by, stopped, and someone inside opened fire. Casillas was struck multiple times and was pronounced dead at the scene; a female relative suffered a graze wound to her arm and survived.

Investigators arrested two Oakland residents, Abdiel Sesai Guerrero, 21, and Selvin Pena, 18, on December 21, 2016, charging them with murder, two counts of attempted murder, and shooting at an occupied vehicle. Police said the suspects were in a green Hyundai that slowed and stopped next to Casillas’s car before the shooting, and both men confessed during interrogation. A third suspect was also arrested; the district attorney’s office had not immediately confirmed that person’s status.

What information about that night or the people involved might help clarify why Casillas and his relatives were targeted?