http://www.benefithouse.com/faq/life_insurance/settlement.html
Contested benefits
Insurance companies
can refuse to pay death benefits, under certain limited circumstances,
if you die within the first two years of a policy. The company's reasons could include:
The insured (now dead) committed fraud when applying for the policy.
The insured did not disclose a material fact on the application.
The insured committed suicide.
A weird happening can waive the two-year limit:
If a beneficiary intentionally killed the insured person, the company can refuse to pay a death benefit no matter how long the policy has been in effect. This is true even if a court has not convicted the beneficiary of the murder.