Mick Jagger has paid tribute to his friend and collaborator, David Bowie.

Bowie passed away on January 10th after an 18-month fight with cancer.

“January 10 2016 – David Bowie died peacefully today surrounded by his family after a courageous 18 month battle with cancer. While many of you will share in this loss, we ask that you respect the family’s privacy during their time of grief,” read a statement posted on the legendary musician’s Facebook page.

Now Jagger, who knew Bowie very well, has publicly said goodbye to his friend.

David was always an inspiration to me and a true original. He was wonderfully shameless in his work. 1/2

— Mick Jagger (@MickJagger) January 11, 2016

“David was always an inspiration to me and a true original. He was wonderfully shameless in his work,” Jagger tweeted.

“We had so many good times together. He was my friend, I will never forget him.”

Jagger then shared a great photo of the two:

We had so many good times together. He was my friend, I will never forget him. 2/2 pic.twitter.com/9xfPj88x8b

— Mick Jagger (@MickJagger) January 11, 2016

David Bowie was 69. He had just released his 26th and final album, Blackstar, on January 8th.