She ended her note by addressing Payne, her boyfriend of two years, directly.
“Liam, my angel. You are everything,” she wrote. “I want you to know I loved you unconditionally and completely. I will continue to love you for the rest of my life. I love you Liam.”
Payne was found dead Wednesday after falling from the third-floor balcony of a hotel in the Palermo neighborhood of Buenos Aires, Argentina.
Though the circumstances around the pop star’s death are still under investigation, a preliminary autopsy revealed Thursday that he died from multiple traumas and internal and external bleeding.
Cassidy, a New Jersey native, had recently traveled with Payne to Argentina. On Oct. 2, the couple were spotted at Buenos Aires’ Movistar Arena, where Payne’s former One Direction bandmate Niall Horan was performing.