The track was co-written with Matt Squire.
'Grief Chapter' is set for release in February.
A visualiser has also been shared for the track.
Find out more and check out the video for the duo's new single here.
It follows previously released single 'Lost'.
The previously unheard track features late vocalist Chester Bennington
ILLENIUM will also be releasing a remix album later this year, find out more here.
The track is out now via Warner Records, check it out here.
It follows their recently released single 'Monster', check it out here.
It follows the release of their 2020 album 'Use Me' Check out their new single here.