Name: Did police miss warning signs before New Mexico school shooting?
Uploaded: Sat Dec 09 2017 14:07:37 GMT+0000 (UTC)
Duration: 1 min 48 s
Description: Police say 21-year-old William Atchison disguised himself as a student before returning to his former high school and opening fire, killing two students and himself. A note he left behind outlined a timeline with details including when he planned to die. NBC’s Tammy Leitner reports for TODAY.

Dec. 9, 201701:48