Batiste, 37, was shot and killed by a Houston police officer as the men allegedly moved in to rob the armored car in east Houston last week.
Attempted armored car heist suspects face judge
The U.S. Attorney's Office-Southern District of Texas confirmed the FBI special agent's statements on the stand.
Stewart, 55, was found shot to death inside his garage in May 2015.
Car dealership owner killed in Montrose-area home