He was reported missing, presumed dead.

有报道说他失踪了，并推定已经丧生。

《牛津词典》

Twelve passengers are missing, presumed dead.

有十二名旅客失踪，并已推定罹难。

《牛津词典》

Eleven people are presumed dead.

有11人已被推定死亡。

youdao

During the same period, it says some 590 people drowned and 359 others are missing at sea and presumed dead.

VOA: standard.2009.09.01

About one quarter of the presumed dead are still considered missing persons, never to be heard from again.

VOA: standard.2009.12.18

So far this year, to have drowned or went missing at sea and are presumed dead."

VOA: standard.2009.09.26

The protestors say in some Channel races, 90% of birds have gone missing, with many presumed dead.

BBC: Is pigeon racing cruel?

The reports are of at least 78 police officers unaccounted for and perhaps 300 firefighters presumed dead.

CNN: Cruel calculus: The death toll

The slick formed when a BP rig sank after an explosion in which 11 men are presumed dead.

ECONOMIST: Politics this week