The mother of the man suspected of killing one woman and injuring four other people in an Atlanta medical office claims her son suffered from mental health issues, according to multiple reports.

Minyone Patterson, the mother of 24-year-old Deion Patterson, reportedly told the local outlet WSB-TV in an interview that her son was upset that doctors wouldn’t give him the anti-anxiety drug Ativan.

She told the Associated Press that the Veterans Affairs health system wouldn’t give her son — who was a former Coast Guardsman — the drug because it would be “too addicting.” She added that he had “some mental instability going on.”

Police say the suspect opened fire in the waiting room of a medical practice in the city’s Midtown area, where his mother had accompanied him. {snip}

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Authorities have identified the one person killed as 39-year-old Amy St. Pierre {snip}

Amy St. Pierre