Besides an action to contest a Will, a frustrated beneficiary may attempt to proceed with a tort known as "intentional interference with an inheritance." In some cases, this may be the ONLY way in which the potential beneficiary can proceed.
In the Nemeth case (425 N.E.2d 1187), for instance, the decedent's stepdaughter (not an heir of the decedent) filed an intentional interference with an inheritance action against her step-sister because a successful Will contest would have done her no good.
A number of cases have followed, trying to explain the limits and ramifications of the tort. A recent case involves the estate of a woman named Grace Ellis (found here as a PDF). The case was brought by the Shriners Hospital for Children, beneficiaries under a previous Will, against a man named James G. Bauman (who was named as sole beneficiary and executor under the Will that was admitted to probate). Ms. Ellis evidently died in 2003, but the Shriners took no action to contest anything until 2006. Maybe their itty-bitty cars were in the shop all that time? Or (more likely), perhaps the Shriners had no idea that they were named as beneficiaries in a previous Will.
Anyway, the Shriners file their suit, making the same sorts of allegations as you might see in a Will contest (lack of capacity and undue influence). But, of course, they can't file a Will contest, because Will contests must be filed within six months after the Will in question was admitted to probate.
Can you use the intentional interference with inheritance tort to get around the six month period, since it isn't a Will contest? No, says the court.