On Dec. 16, in Madison, Wisconsin, 15-year-old Natalie Rupnow shot and killed two other people before taking her own life. Authorities quickly discovered that she had allegedly plotted the attack with ...

The work could take weeks, police said. Authorities are also mulling criminal charges, although it's not clear against whom.

A criminal investigation remains ongoing into a Carlsbad man accused of communicating with a 15-year-old girl behind a deadly ...

A California man apologized for his connection to the 15-year-old shooter who killed a student and teacher in a Madison ...

Alexander Paffendorf expressed regret for his involvement when a judge offered a chance for final words before keeping an ...

A California man apologized Friday for his connection to a 15-year-old girl who fatally shot a teacher and a fellow student ...

A hearing for a gun violence restraining order Friday against Alexander Paffendorf, 20, was continued until April ...

Alexander Paffendorf was detained late last month after FBI agents said he was plotting a mass shooting with Natalie "Samantha" Rupnow.

A Carlsbad man who authorities say communicated with a Wisconsin school shooter appeared in a San Diego courtroom on Friday.