(CNN) In the wake of bombshell testimony in the trial of Navy SEAL Eddie Gallagher, prosecutors are now exploring perjury charges against a witness, according to a Navy email obtained Wednesday by CNN.

Special Operator First Class Corey Scott could face a court-martial for lying to investigators and prosecutors.

When called to the witness stand, Scott testified last week that he, not Gallagher, killed an ISIS prisoner in Iraq two years ago. Scott, a Navy SEAL medic, said under oath, "I suffocated him. I held my thumb over his trach tube until he asphyxiated."

Gallagher, a special operations chief, is accused of multiple violations of military law in Iraq, including murdering a prisoner, posing for a photo next to a corpse, shooting at noncombatants and intimidating SEALs who could report his behavior.

Gallagher has pleaded not guilty. If convicted of murder, he faces life in prison.

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