Cowboys quarterback Dak Prescott mourned teammate Marshawn Kneeland’s death, saying he's carrying a “heavy, heavy heart" for all who loved him.

Dallas Cowboys defensive lineman Marshawn Kneeland died at the age of 24 on Thursday morning, the team announced.

“That’s why I think we all should be careful about what we say to people. I think we should be careful about what we tweet about people. I think we should be cognizant of what everyone’s going throug...