Justin Bieber posted a tribute on Twitter for Thomas Ayad, an international product manager for Universal's Mercury Records label and friend of Bieber's. Ayad was killed in the terror attacks during the Eagles of Death Metal concert at the Bataclan theatre in Paris. As Paris and the world continue to reel from the attacks, Bieber is one of many artists to thank Ayad for his work and contributions to his music:  

Sources: Twitter | LA Times