In this week's issue of PEOPLE, Grigorieva, 40, alleges that Gibson, 54, was physically and verbally abusive to her. The Los Angeles district attorney is determining whether to charge Gibson with domestic violence.
Gibson's attorneys declined to comment about Grigorieva's interview, but his side has repeatedly disputed her allegations.
Grigorieva alleges that the actor attacked her on Jan. 6 in a fit of rage. "It's like something comes over him," she says. During that alleged incident, she recalls, "his pupils dilated, and he's screaming so loudly. Ugly face – like not even his face. It's evil. Just evil."
The rage, she alleges, "could be set off by anything."
Today, Grigorieva says she believes Gibson – who sees their nearly 1-year-old daughter Lucia nearly every other day, including overnight visits once a week – must seek help: "I want him to be treated, evaluated ... he just needs to take responsibility."