It appears police have Alexander Paffendorf, of Carlsbad, California, 20, in custody. FBI agents reportedly "saw the messages from Paffendorf to Rupnow" as they did a sweep of the girl's connections.

A 20-year-old man has been detained by authorities in Carlsbad, California, in connection with the deadly school shooting in Madison, Wisconsin. According to a gun-violence restaining order issued ...