Professional ratings
Review scores
Source	Rating
ARTISTdirect	2008
HipHopDX	2008
IGN	(8.6/10) 2008
Kansas City Star	2008
Metromix	2008
The Pitch	(favorable) 2008
RapReviews	(8.5/10) 2008
Rhapsody	(favorable) 2008
URB	2008

Killer is the seventh studio album by rapper Tech N9ne.Killer's album cover pays homage to Michael Jackson’s iconic "Thriller" album cover. With Killer, Tech N9ne has SoundScanned his 1 millionth album independently.

This album was the first album Tech N9ne recorded as a double disc release, containing 32 tracks. (Everready (The Religion) contained two discs, however the second disc was marketed as a bonus disc and not a part of the album itself.) Guests who were featured on the album include Paul Wall, Scarface, Shawnna, Brother J of X-Clan, Mistah F.A.B., Kottonmouth Kings, Hed PE, Krizz Kaliko, Kutt Calhoun, Skatterman & Snug Brim, BG Bulletwound, Liquid Assassin of Grave Plott, and Ice Cube. While Brotha Lynch Hung was confirmed to be a guest on the album early on, he would be absent from the album in the end. It was later revealed that Brotha Lynch Hung was supposed to be on Psycho Bitch II, but he would have been unable to get his verse back to Tech in time, thus he did not appear. He was instead replaced by Grave Plott's Liquid Assassin.

It features production by producers that have previously collaborated with Tech like Michael "Seven" Summers and David Sanders II, as well as new collaborations such as with Tramaine "YoungFyre" Winfrey, Jonah "Matic Lee" Appleby and Adam "Wyshmaster" Cherrington.

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