Grammy-nominated songwriter and producer, Michael James Ryan, also known professionally as Busbee, has passed away at the age of 43.

Warner Records, which had a partnership with Ryan, confirmed the and shared news of his passing on Twitter.

“Today we lost busbee, a dear friend, business partner with his company Altadena, and one of the best and brightest creative minds in music. busbee’s kindness and legacy will never be forgotten and our hearts and prayers go out to his family at this very difficult time.”

Busbee worked with a broad range of artists including Gwen Stefani, Pink, Maren Morris, Timbaland, Katy Perry and Keith Urban.

“This just doesn’t seem fair,” wrote Morris on Twitter. “I will always love you and the songs and albums I was lucky to make with you, Busbee. Rest well, my sweet friend.”

Blake Shelton also paid tribute on Twitter, writing, “I absolutely can’t accept the loss of mine and Gwen’s friend Michael (Busbee)..Too much to say for social media. Too much pain and unfairness period. I guess sometimes you gotta dig extra EXTRA deep for peace to continue to have faith. And I will because Michael ALWAYS had faith.”

Busbee is survived by his wife and three children. The cause of his death has not yet been made public.