Before Thursday night's preseason opener, the Ravens placed a sign that features Walker's name and years of his birth and death, as well as his jersey No. 25 encircled in black. It's located behind the team's bench and next to the stairs that lead to the locker room.
Walker died in a motorbike accident on March 18, and his death remains an emotional subject for many players. A fourth-round pick from a year ago, Walker was considered "a little brother" by teammates.
Defensive back Anthony Levine keeps a picture of Walker in his locker.
"Every day, before I go out to practice, I see him and think about him," Levine said. "I miss him a lot."