Patti LuPone Recalls the Time She Almost Killed Aubrey Plaza (Exclusive)

Patti LuPone chats with ET's Cassie DiLaura at the Los Angeles premiere of 'Agatha All Along,' streaming Sept. 18 on Disney+. The star shares how 'shocked' she is over the excitement from Marvel fans and is 'happy' to be part of it all. Plus, Patti recalls the time she almost killed co-star Aubrey Plaza when they were living together.