The husband of a missing southeast Missouri woman has been ordered to federal prison for five years for threatening the woman’s sister.

Estranged husband Clay Waller is the main suspect in the disappearance of Jacque Waller, who’s been missing since June first. But he has not been charged in that case. He’s going to prison for writing a threatening internet message to his wife’s sister, who has custody of their 5-year-old triplets.