No, Master Roshi did not die forever in the end of DragonBall Z or even DragonBall GT.
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Im pretty sure it was master roshi
episode 17
Goku learned the Kamehameha wave after witnessing it being used by Master Roshi and he uses it in almost every fight in DBZ .
The one on front of his shirt means he was trained by the Turtle Sage, Master Roshi. The large one on his back means he was trained by the North Kai, King Kai.
You do not. He has left forever.