Revelation 20:14-15
14 And death and Hades were thrown into the lake of fire. This is the second death, the lake of fire. 15 And if anyone's name was not found written in the book of life, he was thrown into the lake of fire. NAS
Hades is another term used for hell and death and Hades (hell) will be thrown into the "lake of fire".
Revelation 20:10
10 And the devil who deceived them was thrown into the lake of fire and brimstone, where the beast and the false prophet are also; and they will be tormented day and night forever and ever. NAS
An eternal "death" of torment awaits those who reject God's truth.