Okay, so we all know now that Qui-Gon taught Yoda the way to immortality, and that Obi-Wan also learned to communicate with Qui-Gon and learned this feat as well. But here's something to ponder. When Qui-Gon is killed, his body doesn't disappear. Yet in the OT, both Obi-Wan and Yoda disappear when they die.

Then in ROTJ, when Anakin dies, his body does not disappear. Could it be that the reason Qui-Gon and Anakin don't disappear is because they are murdered?

Both Yoda and Obi-Wan die peacefully, when it's their "time". Anakin and Qui-Gon, meanwhile, are killed violently. Coincidence? I'd love to hear your thoughts.