Is Paul McCartney DEAD?

There is a rumour going round in the world of The Beatles that Paul McCartney actually died in 1966 and was replaced by a look-alike double. This impostor is still playing the role of Paul to this day. Could this possibly be true? Dr Nick Kollerstrom has investigated this matter and has delivered another live lecture on the subject in Oxford. He has also written a book about it, see: http://terroronthetube.co.uk/paul-and-his-doubles/.
See here for a video of Nick's previous Oxford live event: http://hpanwo-tv.blogspot.co.uk/2015/07/nick-kollerstrom-in-oxford-london.html.