Jordan Brister, a senior at Amplus Academy in Las Vegas, was found unresponsive after suffering cardiac arrest for unexplained reasons, his family said.A family is grieving the loss of a high school senior after he suffered cardiac arrest and was found unresponsive in the school bathroom, they say. Jordan Brister, 18, died Sunday, Jan. 8, after suffering a cardiac arrest on Jan. 3 during the school day at Amplus Academy in Las Vegas, according to a statement by the school shared by NBC affiliate KSNV. He was found unresponsive in the school bathroom after attending gym class, his family told...