A Yemeni man has pleaded guilty to piracy in a U.S. federal court for his role in the hijacking of a yacht in the Arabian Sea that resulted in the deaths of four Americans.

On Thursday, Mounir Ali became the 11th person to plead guilty in the case.

Ali told the court he had no role in February the murders of the Quest's two owners and their two friends aboard the yacht.

Ali admitted to helping Somali pirates for a share of the ransom money.

He faces a life sentence when he goes before a judge for sentencing on October 21.

Four more Somali suspects are awaiting trials in November and January.