He was killed by a bullet in the head.

他头部中弹死亡。

《牛津词典》

We don't know what the percentage of people who survive a bullet in the head is, but we're pretty sure it's very slim.

我们不知道人的头部中弹活下来的几率是多少，但是我们很肯定的是，那样的几率凤毛麟角。

youdao

In interviews with hundreds of women, I heard countless stories of men who chose to take a bullet in the head, literally, rather than violate their child, sister or mother.

在采访数百刚果女性时，我听到无数关于男人宁愿子弹穿透头颅，也不愿亵渎自己的孩子，姐妹或母亲的故事。

youdao

Mr. Merah was found dead on the ground, a bullet in the head, prosecutors said.

WSJ: French Killer Mohamed Merah's Path to Jihadist Rampage

He died of a bullet in the head while driving his family.

NPR: Two Funerals in the Crescent City

"When the car was moving it was caught in crossfire between the revolutionaries and Gaddafi forces in which he was hit by a bullet in the head, " said Mr Jibril, quoting from the report.

BBC: Libya's Col Muammar Gaddafi killed, says NTC