He was sentenced to death by electrocution.

他被判电刑处死。

《牛津词典》

The court pronounced him guilty and sentenced him to death by electrocution.

法庭宣判他有罪，并判他电刑处死。

《柯林斯英汉双解大词典》

Severe injury or death by electrocution is the result.

结果是由于电击而造成严重的伤害或死亡。

youdao

Edison sent word to the commission that although he would like to see capital punishment abolished altogether, death by electrocution was the most humane method--and AC the preferred current.

FORBES: The warlock of Menlo Park