NEWS10 ABC has learned actress Allison Mack,one of the co-defendants in the NXIVM federal case, is negotiating a plea deal.

In a letter to the judge persiding over the case, Mack’s lawyers request the upcoming trial be delayed by 30 days.

The reason they give, Mack is actively engaged in negotiations regarding a potential pretrial resolution of her case.

Two other defendants, Nancy Salzman and her daughter Lauren have already plead guilty.