Killings mark 4th mass murder in Wisconsin since 2004

The killings Sunday at the Sikh Temple in Oak Creek are the fourth mass murder in Wisconsin since 2004.

The previous mass murders are:

Nov. 21, 2004: Six people are killed when Chai Soua Vang, a 35-year-old Hmong immigrant and naturalized U.S. citizen, shoots eight people while deer hunting east of Birchwood in northern Wisconsin. A truck driver from St. Paul, Minn., Vang is sentenced to six consecutive life terms in prison, plus 165 years in confinement, on Nov. 9, 2005.

March 12, 2005: Seven people are killed and four wounded when Terry Michael Ratzmann opens fire at a Living Church of God service at the Sheraton Hotel in Brookfield. Ratzmann, a 44-year-old computer technician, then committed suicide.

Oct. 7, 2007: Six people are killed and one wounded when Forest County Sheriff's Department Deputy Tyler James Peterson goes on a shooting rampage at his ex-girlfriend's apartment. Peterson, 20, then shot and killed himself.