FORT STEWART, Ga. -

Testimony has resumed in the court-martial of a Georgia Army soldier charged with killing his pregnant wife for $500,000 in life insurance and benefit money.

Pvt. Isaac Aguigui faces an automatic life sentence if a military judge convicts him of murder in the July 2011 death of his wife, Sgt. Deirdre Aguigui. A former Army buddy at Fort Stewart testified Monday that Aguigui confessed to handcuffing his wife during sex and suffocating her with a plastic bag pulled over her head.

Prosecutors told the judge upcoming witnesses Tuesday include Army investigators.

Aguigui of Cashmere, Wash., has pleaded not guilty. He is already serving a life sentence at a Georgia prison after pleading guilty last summer to a double slaying that occurred about five months after his wife's death.