Audrina Patridge is mourning the death of her teenage ... Sadie's death comes shortly after the family celebrated her 15th birthday, as seen in a post shared last week. Casey marked the occasion ...

Audrina Patridge's Niece Dead Following Her 15th Birthday: 'It Is the Hardest to Say Goodbye' Patridge, 37, also mourned the loss of her niece by sharing a carousel that featured special moments ...