Teacher, former students recount fatal classroom stabbing of Alberta teen girl at murder trial
![Jennifer Winkler had a talent for design and drawing, her father Dale said. A close-up photo of a teenage girl's face. She has hazel eyes and brown wavy hair, and she's holding a red rose in front of her chin.](https://i.cbc.ca/1.5953623.1721242436!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_620/jennifer-winkler.jpg)
A teacher and three of her former high school students say there were no warning signs before a fatal stabbing unfolded in their Edmonton-area classroom on the morning of March 15, 2021.