Nothing is known about Bello's life prior to or as the outbreak began, except that she was single prior to the apocalypse and saw her career as her life; she had friendships with both fellow officers Tanaka and Amanda Shepherd.
Officers Bello and Tanaka bring in Joan who was recaptured after she tried to escape the hospital. Later as patient Beth Greene sneaks to Dawn Lerner's office, Bello and another officer are seen moving boxes to a room as Dr. Steven Edwards wheels a patient by.
Officer Bello stands with Officers Alvarado and Tanaka as they prepare to exchange Carol Peletier and Beth for Officers Amanda Shepherd and Licari off of Rick Grimes. She watches in surprise as Beth and Dawn are killed, but remains calm as Rick's group departs the hospital.
This list shows the victims Officer Bello has killed:
- Numerous counts of zombies
- Behind the scenes, Officer Bello was dubbed "Officer Jello".