Quote Originally Posted by theangelJean View Post
We've already seen Othar adventuring with Agatha in a story presumably set after the main story. If that's canon, then we can guess that Othar survives the main story. (I am not sure if it is, but if it isn't, then is this current story canon?)
All of those early side stories are depicted as radio plays being (re-)told by the Professors, and so any "facts" in them should be taken with at least a grain of salt.