Yes of course. When your bitcoin stays in wallets or even exchanges and noone even knows he had it or even if his family does know but did not know where he hides his private keys or username and passwords especially he did not save it in his computer or cellular phone, the bitcoin just sits there until someone figures out a way to get it. There's no way of circulating becauase you need to access the account to sell the coin. So make sure you put your keys in your will so your spouse or children can take advantage of your hard earned money.