Mother accused of stabbing her sons to death suffers from mental illness

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A court hearing questioning the mental competency of a mother accused of trying to kill her two young sons on the side of an Adelaide highway has heard she was delusional at the time and told police she was “proud” of what she had done.

Megan Jayne Somerville, 37, of Modbury Heights appeared in the Supreme Court via video link from a mental health facility but was not present when footage of the August 15, 2022, incident was played in court.

The court has previously heard Ms Somerville stopped her silver sedan on the North-South Motorway and removed her two sons, who were then aged three and eight, before stabbing them multiple times.

On Tuesday, the court heard she was experiencing an episode of psychosis, characterized by delusional thoughts, at the time of the incident, and had used both methamphetamine and cannabis in the hours beforehand.

The court is investigating whether her mental illness or her use of illicit drugs was the substantial cause of the offending.

Four videos were played to the court – including two of the incident itself – as well as body-worn camera footage from a police officer, and a video of Ms Somerville being read her arrest rights as she lay in a hospital bed.

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