Easter is set by the first full moon after the vernal equinox. This is the one day in the year when day and night are roughly equal!
It varies by more than a month over the years and so it simply cannot represent the date of anyone's death!!!
It is in fact a combination of several pagan festivals most notably the spring festival.
The name Easter comes from “Eastre” an Anglo-Saxon pagan goddess. Also the Norse goddess,Ostara who took her name from the Teutonic lunar goddess Eostre
Even the Chinese have the festival of Ching Ming where flowers and sweets are put on their ancestors graves!!
The egg and the rabbit are symbols of springtime and rebirth along with the custom of giving flowers etc!!
The Venerable Bede, an early Christian writer pointed out that the Christian church absorbed Pagan practices when it found the population unwilling to give up the festivals. Thus a lot of what Christians now see as Christians practices are in fact pagan!!!
Fun to watch the Christians worshiping a pagan festival though - makes it just like Christmas when they do the same thing!!!