Sad news has struck the Kardashian-Jenner family as Kris Jenner’s sister, Karen Houghton, has passed away at the age of 65, RadarOnline.com can confirm. The exact circumstances of her passing are currently unclear, but San Diego County officials attributed Houghton’s death to natural causes. Law enforcement sources reported Houghton’s death on Monday in San Marcos, California, according to TMZ. Karen, being Kris Jenner’s only sister, shared parents MJ and Robert Houghton. She grew up alongside Kris in San Diego under the care of their mother MJ after their parents’ divorce. Karen and Kris had …