Marysville school shooter Jaylen Fryberg: what we know

There was a shooting at Marysville-Pilchuck High School, just north of Seattle, Friday morning. The gunman, 14-year-old Jaylen Fryberg, is dead of a self-inflicted gunshot wound. A female student is dead and several more are wounded.

Not much is known about Fryberg or his motives, and few clues are available on his social media accounts. In recent weeks, tweets from an unverified Twitter account that appears to have belonged to Fryberg became increasingly angry and melancholy. The last tweet from the account, posted on October 23, read, "It won't last.…...