If we are in the nominative case this is correct. But

"des Verstorbenen": singular, male, genitive

"dem Verstorbenen": singular, male, dative

"den Verstorbenen": either (singular, male, accusative) or (plural, dative)

"die Verstorbenen" ("die" is always used in nominative plural): either (nominative, plural) or (accusative, plural)

In other words: the extra "-n" can be a plural ending or a case ending. Know your declination table inside out and you can find out.