The FBI is investigating a connection between a 20-year-old California man, Alexander Paffendorf, and a 15-year-old shooter, Natalie Rupnow, who killed a teacher and a student before taking her own life at a Wisconsin school. Court documents reveal that Paffendorf communicated with Rupnow and allegedly discussed arming himself with explosives and a gun to target a government building. The FBI detained Paffendorf and searched his home, but it is unclear if he has been charged. Authorities continue to investigate the shooting, having found two handguns at the scene, one of which was used in the attack. The victims were identified as 42-year-old Erin West and 14-year-old Ruby Vergara. The community is grieving the loss.