Yes, death is biblically final.

Job 7:9
As the cloud is consumed and vanishes away, so he that goeth down to the grave shall come up no more.

Job 14:10. 12
But man dieth, and wasteth away: yea, man giveth up the ghost, and where is he? ... So man lieth down, and riseth not: till the heavens be no more, they shall not awake, nor be raised out of their sleep.

Job 20:7
Yet he shall perish for ever like his own dung.

Psalm 6:5
For in death there is no remembrance of thee: in the grave who shall give thee thanks?

Psalm 31:17
Let the wicked be ashamed, and let them be silent in the grave.

Psalm 88:5
The dead ... whom thou rememberest no more.

Psalm 115:17
The dead praise not the LORD, neither any that go down into silence.

Ecclesiastes 3:19
For that which befalleth the sons of men befalleth beasts; even one thing befalleth them: as the one dieth, so dieth the other; yea, they have all one breath; so that a man hath no preeminence above a beast.

Ecclesiastes 9:5
The dead know not anything, neither have they any more a reward.

Ecclesiastes 9:10
For there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.

Isaiah 26:14
They are dead, they shall not live; they are deceased they shall not rise.

Isaiah 38:18
For the grave cannot praise thee, death can not celebrate thee: they that go down into the pit cannot hope for thy truth.