In 1990, the testimony of then 12-year-old Collier (Boyle) Landry helped to convict his father, Dr. John Boyle, of murder. The victim was Collier’s mother, Noreen Boyle,44, who was killed in the family’s Mansfield, Ohio home.

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Collier testified that on the night of his mother’s death, he was awakened between 3:00 and 3:15 AM, “Because I heard a scream coming from my sister.”

Collier went on to testify that a few minutes following the scream he heard a loud “thud,” then a second noise, “And by that time, I was petrified.” He said he didn’t get up to investigate, “Because I was extremely afraid of my father.”

WATCH: Man Says He Confronted Dad In Prison After 26 Years Because He Wanted Answers About Mother’s Murder

In an exclusive daytime Dr. Phil airing Wednesday, Collier, now 40, talks about his experiences, both during the trial and in making the documentary, “A Murder in Mansfield.” He says that when he testified against his father, “I literally stared him down the whole time.”

John Boyle adamantly denied murdering his wife throughout the trial and in the years since. More than two decades later, does Boyle change his story when Collier confronts him in prison with documentary cameras rolling?

Check here to find out where you can watch Wednesday’s Dr. Phil.

Footage/photos provided by Investigation Discovery. “A Murder in Mansfield" premieres on Investigation Discovery and IDGO at 9 p.m. EST on Saturday, November 17, 2018.

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Why A Man Says He Was Adamant About Testifying At His Father’s Murder Trial