Maj. Nidal Hasan could face the death penalty if convicted of premeditated murder and attempted premeditated murder. The second week of the trial is expected to Friday.
Prosecutors are expected to call an FBI agent and others who witnessed and investigated what happened after Hasan left the Soldier Readiness Processing Center building where the shootings occurred.
Two police officers helped take down Hasan, paralyzing him in the process.
For two days, pathologists described how dozens of bullets hit and killed 13 people.
Hasan is representing himself. He has remained mostly silent throughout testimony.
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