Sheryll Pearson tells the Chicago Tribune that she and her husband found out Thursday that their son, Pfc. Michael Pearson, was killed in the attack.

She says the 21-year-old Bolingbrook man joined the Army more than a year ago and was training to deactivate bombs.

Sheryll Pearson says she and her husband received a call from their son's sergeant at Fort Hood. He told them their son had been shot three times, and an Army surgeon later called to say he had died.

Sheryll Pearson says the loss has left the family "all very angry."

The suspected shooter in the attack, Maj. Nidal Malik Hasan, remains hospitalized after being shot four times.