His sister said her heart was "shattered."

Tributes have been pouring in for actor Daniel Mickelson after he passed away at the age of just 23 on Sunday. Mickelson was a rising star in the world of acting, and was best known for his appearance in the 2019 TV series Mani and indie horror film The Killer Clown Meets the Candy Man. His sister Meredith announced the news on Instagram, paying tribute to her brother. She said: "My heart is shattered & to write this feels so wrong and I don’t even know what to say. "Yesterday I lost my brother, best friend & the other half of my heart. There wasn’t a person I loved more on this earth. There's no words that can do him justice that I could write. "To know him was to love him. He was the happiest brightest smiley most sunshine human to exist and I’m so happy God chose me to be his sister for his whole amazing life." https://www.instagram.com/p/CQ9PsL7hOH6/ The comments were flooded with tributes to the 23-year-old from celebrity friends, with the likes of Paris Hilton, Madison Beer and Patrick Schwarzenegger all mourning the young actor's death. Daniel's girlfriend, Maddie Haley, also posted a heartfelt tribute to him, posting photos of him showcasing their relationship over the last year. She wrote: "I don't want this to be real. Words can't even describe how I'm feeling right now. Last night I lost my best friend in the whole world. I feel like my hearts been ripped out of my chest. Daniel you were the kindest person I have ever met. "You lit up every room with your contagious smile and never failed to make anyone happy. There wasn't one day that went by where you didn't go out of your way to make me feel special and loved. I wish I could call you right now and hear you tell me everything is going to be okay." She finished by writing: "Everything I do now is for you. Now I have a guardian angel by my side for the rest of my life. I am going to make you so proud. I love you forever babe."