The trial for a Milwaukee man who prosecutors say methodically shot and killed three of his neighbors at point-blank range will move directly to whether he was mentally competent at the time of the crime.

A Wisconsin man who fatally shot his father and then burned and buried the body has been found not guilty by reason of insanity.

A teen accused of killing his ex-girlfriend's mother in central Wisconsin has pleaded not guilty by reason of mental disease.

A former Dane County sheriff's deputy has pleaded not guilty by reason of insanity in the killings of his wife and sister-in-law.

A convicted Beloit man who used an insanity plea to defend against a murder charge is not entitled to a new trial, the Wisconsin Supreme Court ruled Wednesday.

Despite a few recent cases in which a mental defense was raised, local judges, attorneys and court observers say there has been a decline in the frequency of the defense.

A central Wisconsin woman accused of trying to kill four of her six children to spare them the pain of her divorce has pleaded insanity.

A Wisconsin man who has admitted he killed his three young daughters was an angry, jealous person who decided that his "selfish desire for revenge" was worth more than his girls' lives, a prosecutor said during closing arguments Tuesday.

An Eau Claire man accused of killing a 39-year-old man with a crowbar plans an insanity defense.

An Iraq War veteran charged with fatally shooting his wife, a suburban Milwaukee police officer, while she was on duty on Christmas Eve 2012 entered an insanity plea Friday.

A Milwaukee woman accused of killing a pregnant woman and trying to steal her full-term fetus dropped her insanity plea during a final hearing Thursday before her trial starts next week.

The lawyer for a Milwaukee man accused of shooting and killing his teenage neighbor over allegedly stolen guns says his client plans to use an insanity defense.

The retired chairman of Wisconsin Energy has been granted supervised release following an attack on his wife of more than 60 years.

OSHKOSH, Wis. (AP) — An Oshkosh man accused of bludgeoning a woman to death apparently won’t plead insanity. Twenty-one-year-old Donald L. Martin is charged with first-degree intentional homicide and armed robbery. Martin told investigators he attacked the 22-year-old woman with a hammer last year because he was in a rage and needed drugs to feed his addiction. His jury trial ...