The video shows MacKenzie doubled over, rocking back and forth while sobbing. MacKenzie tells lead investigator Sergeant Dan Oram she didn't mean to kill Thomas but didn't want him in the apartment on Alma Street that night because she didn't want her kids to see them fighting.
She tells Oram of stabbing Thomas in the shoulder after thinking he was coming after her. Sergeant Oram told the court he took that to mean MacKenzie was the aggressor after becoming so enraged.
Defense lawyer David Kelly suggested she wasn't giving an academy award performance during the interrogation but Oram told the court, in his view, she was more upset at her own predicament than what had happened to Thomas.
Kelly got into evidence Thomas' past criminal record for assaults including an order, at one point, to not have contact with MacKenzie.