By Nick Selbe Gladney played college football at TCU and was a first-round pick by the Vikings in 2020. Cardinals cornerback Jeff Gladney was reportedly killed in a car accident early Monday morning, according to Drew Davison and Clarence E. Hill, Jr. of the Fort Worth Star-Telegram. Gladney was 25. His agent Brian Overstreet confirmed Monday’s news to the Star-Telegram. The Cardinals released a statement Monday afternoon, describing Gladney’s passing as a “tremendous loss.” “We are devastated to learn of Jeff Gladney’s passing,” the statement read. “Our hearts go out to his family, friends an…