just as they are turning me back for final vectors, I look down and
see that my right fuel gauge is showing 0 but my left is still around
20. I then intercepted the localizer and turned inbound. It was at
that time the right engine dies. I reached down and hit the cross
feed but nothing.

Another scary thought ...

With the aircraft flying unbalanced (ie banked 5 deg towards working donkey,
and compensating rudder applied), I doubt very much if anything close to the
full 20 gallons would be available.

Curious also as to why such an (apparant) imbalance between the tanks?