"While original reports indicated that Miller may have pushed his girlfriend from his parked car, an investigation into the alleged assault was inconclusive," the Santa Clara District Attorney office wrote in a press release Monday.
Miller's charge comes after the investigation concluded he threw his girlfriends cell phone against a wall and broke it during an argument. Miller will be arraigned Monday afternoon, and could face up to a year in jail.
Miller, 27, has not been with the 49ers in the early stages of the voluntary offseason program, and is likely to remain away from the team until a conclusion arises in the case, according to a report from CSN Bay Area.
"The 49ers organization is aware of developments involving Bruce Miller and will continue to monitor these legal proceedings closely,” general manager Trent Baalke said in a statement.
The night of the incident, police responded to a phone call from Miller's girlfriend, who made the call from a witness' phone, and said Miller had pushed her out of a vehicle, took her phone and smashed it. She refused medical attention and did not sustain visible injuries or complain of pain, according to the press release.
Later, the alleged victim denied there had been any physical contact during the argument.