'Firefly Lane' Series Finale: Sarah Chalke Reacts to Most Heartbreaking Moments (Exclusive)

Spoiler alert! Sarah Chalke chats with ET's Deidre Behar about 'Firefly Lane's emotional conclusion with season 2, part 2, streaming now on Netflix. The actress opens up about the challenging experience of playing Kate Mularkey, who dies from breast cancer. Sarah also shares the scene was the hardest for her to film. Plus, she reacts to the possibility of a ‘Firefly Lane’ spinoff!