The suspect is believed to be Robert Card, a 20-year US Army veteran from Bowdoin Center, Maine.
(according to Telegrams so take with grain of salt)
EDIT: Name confirmed by news.
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According to law enforcement, CARD recently reported mental health issues to include hearing voices and threats to shoot up the National Guard Base in Saco, ME.
According to the article he's actually 40 years old and was recently admitted to a mental health facility for two weeks.
post doesn't mention his age (except his 1983 DOB in the image), just that he was in the military for 20 years