Christopher Masterson attending the Vail Resorts Hold'Em Poker Event For Your Cause held at The Altman Building. New York City, USA - 16.10.07

The 27-year-old star was punched to the ground in the fight, some of which was videotaped and posted on website TMZ.com.

It is unclear what started the altercation, which involved more than 10 people.

Source: WENN