Rising actor and model Daniel Mickelson died on July 4 at 23 years old, sparking an outpouring of emotional tributes from young Hollywood. A cause of death has not yet been revealed for the Atlanta native, but his passing was announced on Instagram Monday night by his younger sister, fashion model Meredith Mickelson. “My heart is shattered & to write this feels so wrong and i don’t even know what to say,” wrote the bereaved sibling. “Yesterday i lost my brother, best friend & the other half of my heart.” Meredith, 22, added, “He was the happiest brightest smiley most...