This must be a Brain Tree quest. Do the Esophagor quest 2 times (first time gives you when and second where the neopet died). Do the quest after you have accepted the Brain Tree quest. That should give you the answer. All of the neopets the Brain Tree asks about are all in his head.
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Assuming this is a Brain Tree quest, in order to get the correct answer to this question, you must complete two esophagor quests. The quests will give you the time and place of where Ethel Jubjub died. Keep in mind, no user on neopets can answer this question, as the answers are completely random and chosen by Neopets Admin.
A Mynci is a species of Neopet that resembles a monkey. http://www.neopets.com/mynci/
Derek Whiteford died in 2002.
Derek Dingle died in 2004.
Derek Stanford died in 2008.