no
Percy Jackson and the Stolen Chariot is a story in the Demigod Files which you're supposed to read before the fifth book and after the 4th book
Grover does not die.
No, Grover did not die. He was still alive and well at the end of the series.
His name is actually Grover Underwood. His best friend is Percy Jackson. He does not die.
No
Martin Grover died in 1875.
Grover Simcox died in 1966.
Linda Grover died in 2010.
Grover Sellers died in 1980.
Frederick Grover died in 1973.
Grover Seitz died in 1957.
Grover Hutchins died in 2010.