Where a life insurance policy required “due proof” of death, the beneficiary is not required to provide the death certificate or specific paperwork, but must provide evidence beyond mere notice of death to invoke the policy.The 1st District Appellate court reversed the decision of Cook County Circuit Judge Patrick J. Sherlock.John Tsichlis was for many years a successful real estate developer in the Chicago area. However, following the recession, his business fell apart, with his adjusted gross income falling …