'Zombie debt': When collectors haunt you

After Kim Mullen filed for bankruptcy in 1993, she cut up all her credit cards in her lawyer's office. Since then, the Levittown resident has managed to obtain a good credit rating.

But in December, a debt collector contacted her, saying she had an unpaid card balance of $5,655 from 1992. With interest, the letter claimed, the debt had grown to $19,400.

As old debt seems to rise from the dead, it's taken on a name -- "zombie debt." And in recent years, more and more such debt is coming back to haunt consumers, according to their advocates and lawyers who specialize in debt.

Mullen, 46, says she doesn't remember the debt and has challenged it. Others who have received such notices say the purported old debts are a result of identity theft.