By Caroline Gaspich Kris Jenner’s younger sister Karen Houghton’s official cause of death has been revealed after she tragically died earlier this week. Officials previously attributed her death to “natural causes” leading from speculation by fans as to what caused her unexpected death, but it has now been confirmed that it was due to heart issues. According to Karen’s death certificate obtained my TMZ, her sudden cause of death was due to cardiac arrest and sudden cardiac arrhythmia. The documents also reveal that Type 2 diabetes was an underlying secondary cause of Karen’s passing and that s…