Police say the man who opened fire at a Wisconsin business was known to authorities in South Dakota.

At a news conference Friday morning, Middleton’s Police Chief said 43-year-old Anthony Tong had “contact” with police in South Dakota in 2004 involving a mental health issue.  Because of that incident police say Tong could not legally purchase a firearm.

Thursday’s shooting seriously hurt three people.

Police shot and killed Tong.