This time it is his older brother who was living in exile in Malaysia since the North Korean dictator killed his uncle and other family members a few years back. Apparently, that wasn't good enough for Kim so he had his brother killed just in case.
http://www.cnn.com/2017/02/14/asia/kim-jong-un-half-brother-death/index.html Kim Jong Nam is the oldest brother, BTW, who was the heir apparent before getting caught sneaking into Tokyo with a fake passport. It seems like he liked freedom too much to ever be a threat to Un's throne.
