During the millennium will death only be found in the temple sacrifices?
There are no sacrifices during the Millennium. The Temple will only serve during the last seven years of the 490 year covenant God allotted to the nation of Israel. At the end of the seven years the Jewish people accept Jesus as the Messiah and there will no longer be a sacrifice but they will realize that the once and for all sacrifice of Christ was sufficient.
Scripture says nothing of death during the millennium other then we know that at the end of that time is when death is ended so your guess is as good as mine.