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ARAPAHOE COUNTY - The Arapahoe County man accused of killing his mother and dismembering her is competent to stand trial, Judge John Wheeler ruled Wednesday morning.

Ari Liggett is charged with first-degree murder, vehicular eluding and crime of violence in the murder of Beverly Liggett.

Police say Liggett killed his mother in her Centennial home in late 2012. According to the arrest affidavit, Liggett murdered his mother, drove around with her remains in the car and was arrested by the Arapahoe County Sheriff's Office shortly after the murder.

On Wednesday in court, Judge Wheeler said based on the Feb. 11 competency examination at the Colorado Mental Health Institute in Pueblo, "the opinion of the psychologist providing the examination Liggett is competent to proceed to adjudication."

Liggett appeared in court Wednesday morning in an orange jumpsuit, wearing shackles, and with long dark hair covering half his face - even when he spoke to his public defender.

The preliminary hearing for Liggett is scheduled for April 12.

The fact that the judge found Liggett fit to stand trial does not impact the future plea Liggett will enter at arraignment.

Liggett's father told 9NEWS in 2012 his son had a history of mental illness.