Comedy legend Bob Newhart has passed away, leaving fans mourning his death after decades in show business. Stars from The Big Bang Theory and Young Sheldon were among those saddened by the news. Newhart's final acting role was as Arthur Jeffries, also known as Professor Proton, in both Young Sheldon and The Big Bang Theory. His work inspired many actors and writers in the industry, and his legacy will be greatly missed. Source: People.