Why was Gregor Samsa transformed in an insect? Why was Gregor Samsa transformed in an insect? Did he die? What will be a great thesis?

There is no
reason given for Gregor Samsa's transformation. The opening lines are as much explanation as is
ever given; the characters in the book show less surprise at the actual event and more disgust
that Gregor is a giant insect. The metamorphosis itself is simply a given; there is no
justification, or any reason that Gregor's human mind remains intact. Even Gregor himself is not
so worried about the change:

"This getting up
early," he thought, "makes one completely idiotic. A man must have his sleep. Other
travelers live like harem women."

One implication is
that his transformation is simply another joke played by an uncaring universe. Gregor is unhappy
at home and at his job; despite his optimism that his hard work will change his status, he
believes in determinism, and thinks that he will never truly escape from his position. In that
case, his physical change is simply a representation of his mental state; he thinks of himself
as a drone of the state and of his job, and so he becomes an insect, which operates in a
hive-mind and has no autonomy of its own.

Another possibility is that he is
transformed because the plot demands it. In other words, Gregor is a pawn of the author as much
as of anyone else; he changes physically because otherwise, there would be no story. Here, the
needs of narrative intrude on Gregor's reality and alter him as necessary.