Girlfriend mourns San Bernardino victim who died shielding co-worker

Shannon Johnson was called a hero for shielding his injured co-worker, Denise Peraza, during the San Bernardino attack. Johnson's girlfriend Mandy Pifer told CBS News that she and Johnson were planning to marry in the next month or so. Pifer is a grief counselor, and she had just finished meeting with a client when she learned of the shooting. David Begnaud reports.