Poor Mark, he's joined his friends Fred, Harry, Stan and Paul in the ranks of those that have met a sticky end just to give you a cool household widget.
He has met a sticky end, a squishy end to be more precise, his floppy body trapped within the pages of your book, scrabbling to get out, all the while happily keeping your place.
You know, keeping the page of that point in the story where the man gets crushed by a giant encyclopedia. Forget pressed flowers and old receipts, Mark is the future and what else will he do now he's dead!