My heart's heavy, so unfair: Timberlake on his backup singer's death

American singer-actor Justin Timberlake took to Instagram to mourn the demise of his long-time background vocalist Nicole Hurst, who passed away at the age of 39. "My heart is so heavy...she was a constant source of joy...Some things feel so unfair and we will never understand why they happen...Nicole...I'm going to miss you...I love you, my sister," he wrote.