The 23-year-old transgender shooter slaughtered eight-year-old Fletcher Merkel and 10-year-old Harper Moyski as they attended mass at the Annunciation Catholic Church on Wednesday.

It's difficult to imagine a more horrific crime than killing children as they pray in church, so it will be a particular challenge trying to understand the sort of person prepared…

The shooter who attacked a Catholic school on Wednesday posted social media videos and writings that betrayed a litany of grievances and obsessions.