A trial involving the son of a prominent figure in the region’s American Indian community has been postponed while the defendant, 25-year-old Sean P. McBride, looks for a new attorney.

McBride, of North Stonington, is accused of slashing Ashbow Sebastian, 21, of North Stonington and Brandon Brisbois, 22, of Ledyard with a folding knife on Jan. 4, 2013, inflicting serious injuries to both men. McBride was also injured in the incident, which took place at a home on Yawbox Valley Road in North Stonington. He claims he assaulted the men in self-defense after they attacked him.

Sebastian is the son of Ashbow Sebastian, war chief for the Eastern Pequot Tribal Nation.

McBride has pleaded not guilty to charges of first-degree assault, second-degree assault and carrying a dangerous weapon. He turned down an offer to plead guilty to a felony charge in exchange for a two-year prison sentence and opted for a trial in New London Superior Court.

The trial was set to go forward Wednesday before a six-member jury, but Judge Barbara Bailey Jongbloed on Monday granted defense attorney Gregg W. Wagman’s motion to withdraw from the case and discharged the jury after Wagman notified the court that he had a conflict of interest. Wagman said he learned last week that the state plans to call as a witness Justin Patt, whom he represents in another case.

Prosecutor Stephen M. Carney said he had included Patt’s name on a list of potential witnesses he read to prospective jurors and asked police to speak to Patt as he prepared the case for trial. Carney notified Wagman last week that he planned to call Patt to testify based on new information that came to light.

Jongbloed granted Wagman’s motion to withdraw from representing both McBride and Patt. She told McBride he needs to hire another attorney who understands that the case is ready for trial. She continued the case to Nov. 25.

According to an arrest warrant affidavit, McBride, Sebastian and Brisbois went to a party in a hotel room at Foxwoods Resort Casino. McBride left the party and texted Brisbois from a nearby gas station to ask for a ride in exchange for some marijuana. Brisbois and Sebastian picked up McBride but decided he should pay them $20 for the ride. McBride, upset at the way he was treated at the party, did not give the men any marijuana or money and they began fighting after they arrived at the home of their friend, Kyle Hogan, according to the affidavit. McBride slashed Brisbois and Sebastian in the face with the folding knife and Brisbois struck McBride with a shovel, according to the affidavit.

Sebastian received 27 sutures and required follow-up surgery for a 12-cm wound from the scalp to just above the right lip. He also suffered a cut to his lower left chest. Brisbois suffered an 8-cm wound to the left gluteal area, or buttocks, that required surgery and received four sutures for a cut to his left elbow.

McBride was treated for contusions to the left side of his face, nose and right wrist, according to the affidavit.

McBride is a graduate of the University of Connecticut and an Eagle Scout who holds a full-time job, according to Wagman. Sebastian is a student at the University of Maine and Brisbois is an electrical apprentice. None of the men has a criminal record.

k.florin@theday.com

Twitter: @KFLORIN