Kris Jenner’s sister, Karen Houghton, died at 65 years old due to heart problems. The sister of the Keeping Up With the Kardashians star’s death certificate revealed her cause of death was cardiac arrhythmia and cardiac arrest with Type 2 diabetes listed as an underlying cause. Per a news outlet, she passed away on Monday, March 18, at her San Marcos, Calif., home. She was cremated later that same week. As OK! previously reported, Jenner confirmed her sister’s death in a lengthy tribute shared to Instagram on Tuesday, March 19. “It is with the heaviest heart and deepest sadness that I share th…