The band made the song available as a free download via their official website, following its premiere on Zane Lowe's Radio 1 show this morning (January 6).
'Better Off Dead' features on Lostprophets' fifth studio album Weapons, which is released on April 2 via Epic.
2010's predecessor The Betrayed reached number three in the UK album chart on release.
The band have two top ten singles in 2004's 'Last Train Home' and 2006's 'Rooftops (A Liberation Broadcast)'.
Lostprophets toured the UK last year and also played a number of summer festivals.