That man is a homicidal maniac.

那人是个嗜杀成性的疯子。

《柯林斯英汉双解大词典》

Ponda teamed up with trouble-magnet Dr. Evazan after saving the life of the homicidal maniac in the Corellian system.

在科雷利亚星系救了埃瓦赞医生一命后，庞达就跟这个惹是生非的杀人狂共事。

youdao

If I were going to beget a child knowing that the child was going to be a homicidal maniac, I should be responsible for his crimes.

如果，我知道我即将生出的小孩以后是一个杀人狂，那么我就有责任对他的罪行负责。

youdao

You know, like not trying to reanimate a six foot tall homicidal maniac in an abandoned castle, or not looking into the eyes of Count Dracula.

FORBES: Frankenstein Posters Come Back From The Dead To Defraud Collectors

There they find, in ascending order of strangeness, Dr. Cleave (Ian McKellen) and his brooding patient Edgar (Marton Csokas), whose career includes stints first as a sculptor and then as a homicidal maniac.

NEWYORKER: Asylum

When a character becomes a franchise, there is only so much repetition that he or she can take before sliding into parody, and there is something distasteful in the thought that we are being urged to treat a homicidal maniac as a lovable rogue.

NEWYORKER: Red Dragon