Tuesday marked the 43rd birthday of Vitor Belfort’s sister Priscila, who went missing in the year 2004. Over the years, several arrests have been made with respect to Priscila Belfort’s tragic disappearance, but she was never found.

Unsurprisingly, the pain of this loss is still incredibly close for Vitor Belfort and his family. On Tuesday afternoon, the former UFC champion and long-time middleweight contender penned an open letter to his missing sister, and it is absolutely heartbreaking.

See Vitor Belfort’s letter to Priscila below:

Exactly 43 years ago a princess was born. Her name was already pronounced sweet. PRISCILA VIEIRA BELFORT was born. Pri, wherever you are I really want this message to come to you. I hope in God’s Eternity of all creation. You can have access to LOVE messages. In fact, our father had already said that love is greater than everything. And it is with this love that I come to congratulate you on your birthday. I promise that somehow I will celebrate this day as if you were by my side. Pri, my kids always ask you! They want to know every detail of your life. @davibelfort @vitoriabelfortoficial and @kyarabelfort it is logical that you could not forget your great friend @joanapradob who turned out to be your confidant … rsrs Well … we love you very, very much. And Pri just spoke to Mom and she promised that on this big day she will celebrate her birthday without staying at home. She told me she’s going out and walking with a friend … Daddy you know what it’s like? LOL It’s still the same … That day especially we all wanted to be able to hug you and kiss you. I forgot to say; Dad returned to live in BH with our family. He is being very well taken care of there. All cousins ​​and aunts love you very much and say that they miss you a lot. All our cousins ​​have already become parents with beautiful children! You can not imagine every beautiful nephew we have !! Well I write this letter directly from Montreal in Canada, on January 14th I will do my last fight on @ufc. Pri, they have been fighting for 21 years and I confess that I can not wait to follow up on my second journey. In which all who participate will be winners. I and @joanapradob created @belfortfitnesslifestyle a new model of gyms and next year we started opening for franchises. We are very happy with the result. We have a huge list of interested people and our students have become a great family. I’m sure you would love our students, each with a wonderful story. Pri, right now I had to wipe away many tears from my face when I wrote this letter but I know that every tear is translated by God. Because only He understands that language. I Love you, my sister.

A post shared by Vitor “The Phenom” Belfort (@vitorbelfort) on Dec 5, 2017 at 8:28am PST

Our thoughts are with Vitor Belfort and his family as they continue to cope with this tragedy.

This article first appeared on BJPenn.com on 6/12/2017.