MADISON, Wis. (AP) - The Wisconsin Supreme Court has ordered a new trial for a man serving life in prison for poisoning his wife and drowning her in the toilet.

The court says the discovery that one of the prosecution's expert witnesses lied under oath about his credentials is enough for Douglas Plude to win a new trial.

The 41-year-old Land O'Lakes man was convicted of first-degree intentional homicide in the death of Genell Plude. He was sentenced to life in prison in 2003.

Genell Plude was found dead with her head and face in a toilet bowl in her mother-in-law's home in 1999.

Prosecutors contended Plude murdered his wife by poisoning her with a migraine headache drug and pushing her face into the toilet to drown her while she vomited.