Do you know what type of orchid it is? (Phalaenopsis, Dendrobium or Oncidium type; which are the most common ones).
I agree that it sounds like crown rot. Since the plant has completely died, it sounds like the rot got in pretty deep and there's a fair chance there is no healthy tissue left for it to regrow from. Honestly, unless you really are determined to try and save it, I'd just toss the plant and get a new one, and we'll help you out with how to grow it so you can try to keep that one healthy.
And welcome to orchidboard by the way!