AceShowbiz - It's been four years since the death of Bobbi Kristina Brown shocked the whole world. Marking the fourth anniversary of her passing, her dad Bobby Brown took to Instagram on Friday, July 26 to share an emotional letter that he wrote for his late daughter.

Referring to Kristina as "baby girl," the "New Edition" singer wrote, "Every day I hold you close to my heart. I think about so many of the things you used to do, from a little girl to a beautiful young lady. I just smile! It reminds me of how much I miss my little girl more and more every day. So loved and so missed."

He went on calling attention to the foundation that her family established in her honor. "In keeping the flame burning, our family has started the Bobbi Kristina Serenity House foundation that is doing great things to help others in need, the way you would have if you were here," Brown continued, before concluding the emotional letter, "Krissi, on this special day, we honor you, we love you and we shine a light on your memory."

Prior to her death, Kristina was found face down in a bathtub in her Alpharetta,Georgia home. Nick Gordon, her fiance at the time, performed CPR until the paramedics arrived and transported her to North Fulton Hospital in Roswell, Georgia. It was suspected that she might have been injured by Gordon during a domestic argument, but the man was never charged for anything related to the incident.

Kristina eventually died from lobar pneumonia on July 26, 2015 after being in a coma for nearly six months. Funeral services were held in August 2015 at St. James United Methodist Church in Georgia, and she was later buried next to her mother Whitney Houston at Fairview Cemetery in Westfield, New Jersey.

Following her passing, the Bobbi Kristina Serenity House, a non-profit Domestic Violence Safe Haven, was founded by Brown in 2015. The organization is "committed to empowerment; regaining power within, instead of seeking approval and power from the outside source."