The Michigan Supreme Court has delayed the criminal trial for the parents of Ethan Crumbley, the teen who killed four students at his Michigan high school last year.

The court ordered the state appeals court to hear an appeal from James and Jennifer Crumbley on Tuesday – a day before the one-year anniversary of the shooting at Oxford High School.  The trial had been set for January.

Ethan Crumbley, who was 15 at the time, killed four students and injured six more plus a teacher. He has since pleaded guilty to murder and terrorism and is awaiting sentencing.

The teen's parents were charged with four counts of involuntary manslaughter, having been accused of ignoring their son’s mental health needs and making a gun accessible at home. 

ETHAN CRUMBLEY PLEADS GUILTY TO CHARGES

James Crumbley and Jennifer Crumbley

James and Jennifer Crumbley were charged with four counts of manslaughter in the 2021 shooting at Oxford High School in Michigan. (Oakland County Sheriff's Office via AP, File)

Defense lawyers have argued that the Crumbleys couldn’t have known what their now 16-year-old son was planning and therefore cannot be held criminally responsible for his independent acts.

Ethan Crumbley in court

Ethan Crumbley answers "yes" to charges against him from assistant prosecutor during his pre-trial hearing at Oakland County Courthouse on Oct. 24 in Pontiac, Mich. (Clarence Tabb Jr./Detroit News via AP, File)

MICHIGAN BOY, 10, THREATENED TO SHOOT UP SCHOOL LIKE OXFORD SHOOTER ETHAN CRUMBLEY: REPORT

"The Crumbleys did not counsel EC in the commission of the school shooting or act jointly with EC in any way," attorney Shannon Smith said in a court filing, using Ethan Crumbley's initials. "To the contrary, the Crumbleys had no knowledge that their son intended to commit multiple homicides."

Jennifer Crumbley, left, and James Crumbley, right, the parents of Ethan Crumbley, a teenager accused of killing four students in a shooting at Oxford High School, appear in court for a preliminary examination on involuntary manslaughter charges in Rochester Hills, Mich., Tuesday, Feb. 8, 2022. (AP Photo/Paul Sancya)

The January trial of James and Jennifer Crumbley, parents of Oxford High School shooter Ethan Crumbley, was postponed by the Michigan Supreme Court on Tuesday after an appeal. (AP Photo/Paul Sancya)

The Supreme Court said the appeal is limited to whether there was "sufficient evidence of causation" to send the Crumbleys to trial.

CLICK HERE TO GET THE FOX NEWS APP

Jury selection in Oakland County court had been scheduled for Jan. 17.

The Associated Press contributed to this report.