reporter: four students, aged 14 to 17, were killed, including justin shilling, who died in the hospital this morning. seven others were injured. it was just incredibly disturbing. reporter: oakland county sheriff michael bouchard says investinvestigators are scruting school security video that captured the entire rampage. from my look at the video, it was random and cold hearted. reporter: and crumbley is being held without bond. he pleaded not guilty. the county prosecutor says more charges could be filed, including against his parents. classes here are canceled for the rest of the week, margaret. brennan: nancy chen in oxford. thank you. the supreme court heard arguments today in what is widely seen as the most significant abortion case in a generation. the justices ruling likely won t come for months, but the hearing itself sparked intense debate, both inside and outside the court here in washington.