A Jacksonville, Fla., teenager with liver cancer who went to her high school prom with an N.F.L. player has died. Khameyea Jennings, 18, died Thursday, said Cindy Hamilton, the Wolfson Children’s Hospital spokeswoman. Earlier this month, Jennings went to her prom with the Jacksonville Jaguars defensive tackle Sen’Derrick Marks, who drove the couple to the prom in his Lamborghini.