Unfortunately, many sources (though no major news outlets yet) have confirmed that Elisabeth Sladen, known for playing her role as Sarah Jane Smith on Doctor Who and the Sarah Jane Adventures, has passed away.
We will post more information once this is 100% confirmed from a reliable source. (Though an account from Nicola Bryant, who played Peri on Doctor Who and in many Big Finish audios, has confirmed Sladen’s passing on her official Twitter account.)