According to Santa Clara police, McDonald was arrested at approximately 7 a.m. local time Monday after officers said he "physically assaulted the victim while she was holding a baby."
Defilippis confirmed that the accuser in this case is McDonald's former fianc?e, who also was the alleged victim in an incident in August.
His release from the 49ers came just a month after the Santa Clara County district attorney's office announced it had declined to file charges against McDonald in a separate domestic violence investigation stemming from an arrest on Aug. 31 while celebrating his 30th birthday at his Northern California home. Prosecutors cited conflicting versions of what happened, a lack of verifiable eyewitnesses and a lack of cooperation by the alleged victim, McDonald's then-fianc?e, in explaining their decision not to pursue charges in the domestic violence investigation. The NFL also announced that McDonald would not be subject to league punishment.