Kyler Robertson's father was stabbed to death Sunday afternoon during an argument, a tragedy that the 16-year-old boy has struggled to understand. On Tuesday, still grieving, Kyler decided he would rather go to Byron Nelson High School and be around his friends than stay home. When he arrived at the Trophy Club school, his eyes were bloodshot and watery. He was accused of being under the influence of marijuana, according to a Northwest school district document provided to the Star-Telegram. Kyler was suspended for three days and was told that beginning Friday, he would be placed in the district's alternative...