When a life insurance claim is denied, it's usually because the death occurred within the first 2 years of the policy being "In Force", which is known as the contestability period, and it's discovered the applicant for life insurance intentionally lied on the application to get the life insurance coverage, or the insured person committed suicide within the first 2 years of being insured.

Once the contestability period expires (first two years), and death occurs, the life ins...