Rihanna shared a touching tribute to a fan named Monia, who died after a third battle with cancer.

“This Christmas, we lost a beautiful spirit who was such a pillar of strength to us! Most of our friendship she’s spent in a hospital or doctor’s office! This picture was just a few months ago, she looked at me and said “Rih the cancer is back” I’ll never forget the fear in her eyes this day!,” Rihanna wrote on Instagram, captioning a selfie of the pair. "Still she pushed forward, fighting the fight everyday with the Navy behind her supporting her every step of the way! We are all heartbroken about this!!! You will never be forgotten! Love you my angel @moniasto fly in peace."

The singer also posted a video of her embracing Monia at an event, captioned, “Miss you already sis.”

Earlier in the month, Rihanna shared words of encouragement on one of Monia’s final Instagram posts: "Sis we are all praying for you! Your strength and your ability to let the beauty in your spirit shine through, even in the midst of adversity, is tremendously inspiring!! Thank you for continuing to share your journey with us! I imagine it's quite a lonely one, hours on end in hospital walls, being scared to even fall asleep because you're afraid u won't wake up, feeling like nobody will ever understand that, the physical agony, the medication and all their side effects...I can't begin to imagine what you feel, so I want you to know we are all here for you and I encourage the NAVY to rally around you during these times! Love you!"