Son who allegedly poisoned and killed his mother pleads not guilty by reason of insanity

Ari Liggett, who is accused of poisoning and dismembering his mother and then driving around with her remains in the back of an SUV, entered a plea of not guilty by reason of insanity on Monday.

Liggett faces one count of first-degree murder in the death of his mother, 56-year-old Beverly Liggett.

According to the Denver Post, Arapahoe District Judge William Sylvester ruled that Ari Liggett will undergo a court-ordered mental health evaluation at the Arapahoe County Jail, where the 24-year-old is currently being held. The evaluation is expected to last 60 days.

Sylvester read Liggett a 23-point advisement during Monday's hearing, advising him of the conditions of entering a plea on not guilty by reason of insanity.

Liggett allegedly poisoned his mother after she removed him from her will. Greenwood Village police officers say they found him Oct. 17 driving around with his mother's remains in an SUV.