Police are looking into the Madison, Wisconsin school shooting suspect's "turbulent home life," verifying an online declaration and determining the origin of the gun used.

The suspect, Natalie Rupnow, who went by Samantha, died from a self-inflicted gunshot wound, police said. The Monday morning shooting at Abundant Life Christian ... insights into her feelings to call ...

At least 165 people have died this year in U.S. mass killings, which are defined as cases in which four or more people die ...