Armstrong was last seen using his wife Iris Armstrong's debit card at an ATM right after the murder.
The woman was found dead in the couple's home. Investigators have not said how she died.
Armstrong is about 6 feet tall and weighs about 150 pounds. The FBI said he should be considered armed and dangerous.
Armstrong has ties to cities across the country, so the FBI is spreading the net wide. The cities include:
Houston, TX, Dallas, TX, Amarillo, TX
Orange County, CA, Los Angeles, CA
New Orleans, LA
Anyone who sees Armstrong should not approach him. Call 911 or your local FBI office right away.
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Military officials said 24-year-old Iris Armstrong was from Columbia, South Carolina. She was a human resources specialist assigned to the 189th Combat Sustainment Support Battalion, 82nd Airborne Division Sustainment Brigade.
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