Even host Carson Daly participated in The Voice's moving tribute to those lost in the tragic Sandy Hook Elementary School shooting this past week. Judges Christina Aguilera, Adam Levine, Cee Lo Green and Blake Shelton were front and center holding up names and ages of those children and faculty killed on Friday as they covered Leonard Cohen's Hallelujah along with the contestants of the show.

Levine tweeted on Monday: "Sometimes I just simply wonder why certain things have to happen."

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Monday night's The Voice was one of last shows of the season, and three contestants' last chance to woo the judges.