SINGAPORE - An ex-policeman who was sentenced to death in 2015 for a crime that came to be known as the Kovan double murder has failed in his clemency petition to the President.

In 2013, Iskandar Rahmat, 40, stabbed to death a 67-year-old businessman in his home. He also stabbed the businessman's 42-year-old son who chanced upon the crime, and who ended up being dragged under the getaway car.