Police reports say Ricci told associates before the attack that he saw black men hitting a white woman, though it's unclear if that claim was accurate.
Rebecca Wilder, a spokeswoman for the Maricopa County Attorney's Office, which is prosecuting Ricci, declined to comment on the case.
Earlier in the day, the film-maker and the actor appeared together at a photocall for their movie at the city's Grand Hyatt Hotel.
According to Deadline, Joaquin admitted that he experienced something of a first at the festival, in that he was actually getting involved in the activities.
Ricci pleaded not guilty, and his lawyers have raised questions about the ability of Jaeger's boyfriend, Jeffery Wellmaker, to identify him as the triggerman.