FORT HOOD, Texas -

Military prosecutors have rested their case against the Army psychiatrist accused in the 2009 shooting rampage at Fort Hood.

Prosecutors wrapped up their case Tuesday during the military trial of Maj. Nidal Hasan, who is accused of killing 13 people and wounding more than 30 others at the Texas military base in November 2009.

Prosecutors called nearly 90 witnesses. Many of them identified Hasan as the gunman who opened fire inside a crowded medical building at the sprawling Army post on Nov. 5, 2009.

A photographer who was taking pictures of a graduation ceremony on post testified in court on Tuesday.

"I heard gunshots,” said photographer Steven Bennett. “Mass amounts of people started running towards the theater.”

Bennett identified the man he saw as Army psychiatrist Major Nidal Hasan.

"I saw an individual acting suspicious, very strangely,” Bennett testified. "He was checking the doors of the building. I started taking photos of this person. He was very agitated, frantic. He seemed unnatural.”

Bennett also told the court he had a brief conversation with Hasan.

"He told me it was a paintball gun and that this was a training exercise,” Bennett testified.

Government prosecutors introduced a series of photographers taken by Bennett as evidence. 

"He disappeared in between some buildings and I heard more gunshots,” explained Bennett. “I thought I'd better take photos in case someone needed them later.”

Bennett also testified that he took a picture showing wounded officer Kimberly Munley.

"Officer Munley was against the door bleeding,” Bennett said.

Hasan is representing himself during the trial.

Hasan would then begin to lay out his defense, though it's unclear whether he will testify.

Hasan faces the death penalty if he’s convicted. If Hasan gets a death sentence, the case will automatically go to the military appeals courts, which have overturned most of the death sentences they have reviewed.

Court is in recess until Wednesday.