Matthew was arrested after the incident in Cleveland, Ohio, last Sunday , but was released pending Heather's decision to press charges, which she has since done.
Fourth of Stieg Larsson's 'Millennium' novels set in Ireland
Sandra Bullock and Ryan Reynolds sign on for new animated TV show 'And Then There Was Gordon'
The new ‘Twilight? Spielberg’s Dreamworks snaps up Irish fantasy series
She told Fox 8: "Right now it's considered a civil matter and that's why he was ultimately released Sunday morning, so I would have to press charges."
After Matthew initiated the attack, she retaliated, causing a cut to his lip.
He had to be pulled away by three men and was detained by an off-duty policeman until law enforcement arrived.
Speaking after the incident, Heather said: "I told him several times that he was trespassing, that it was a private party. He never said a word to me, he just stood there staring at me. He was inebriated and the smell of him was like a bar. After the third time I told him to get off my bus, he just stepped in for a right hook to my pelvis area and started wailing on me like I was a man.
"I had no idea who he was at the time. I did not know until after he was in custody. I'm pressing charges. Assault is wrong, I really do feel violated. He was hitting me in places I didn't think anybody would hit me... my breast area, my pelvis area."