该杀人犯显然精神失常。用英语怎么说？

该杀人犯显然精神失常。

The murderer was apparently mentally disturbed.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

murderer

n. 谋杀犯，凶手；

例句
Now the murderer has two deaths on his conscience.
现在，这个杀人犯背着两条人命，受到了良心的谴责。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

apparently

adv. 据说，似乎，看来，显然；

例句
He was apparently quite converted from his anarchist views.
显然他基本上完全放弃无政府主义的观点了。

mentally

adv. 心理上，精神上，智力上；

例句
Lieutenant Ryan closed his eyes, first mentally viewing the different crime scenes, then correlating the data.
瑞安中尉闭上眼睛，先是在脑海里回想了一遍不同的犯罪现场，然后将这些信息联系起来。

disturbed

adj. 被扰乱的，心理失常的，为心理失常者服务的；v. 干扰(disturb的过去分词)；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。