Policies written in my state have a 2 year exclusion period for suicide. If you die by suicide before the two years has elapsed, they return your premiums paid, without interest.
It varies by state and you must always check where the policy is written, in addition to any rules in the state where you reside, just in case they are different. (One example of this would be a national employer who has policies written in the state where their home office is, regardless of where the employee lives.)