He was charged with murder, but got off on a plea of insanity.

他被指控犯了谋杀罪，但以精神错乱为由逃过惩罚。

《牛津词典》

I also think we must do something about the insanity plea.

我还认为我们必须对疯狂的抗辩采取行动。

youdao

In August, federal prosecutors and a judge accepted Albrett's plea of not guilty by reason of insanity.

八月，联邦检察官和法官因阿尔布若特精神错乱，接受了其无罪的抗辩。

youdao

Last week, defense attorneys publicly acknowledged for the first time that they were considering an insanity plea.

NPR: Colo Shooting Suspect Was Hospitalized, Restrained

An insanity plea is at the intersection of law and psychology or psychiatry.

FORBES: Holmes Wants to Plead Insanity For Colorado Theater Shooting. What Does Insanity Mean?

But an insanity plea could make such a move harder, said David Beller, an attorney who is not connected to the case.

CNN: Judge enters not guilty plea for accused theater shooter