He has already demonstrated his ruthlessness by executing both his uncle and his one-time girlfriend, not to mention numerous other North Koreans who have incurred his displeasure.
But could Kim Jong Un, the country's new dictator, have purged even his own wife from his inner circle? Speculation as to the fate of Ri Sol Ju, the petite former singer whom he married in 2009, is growing in the aftermath of the sudden death of Kim's uncle, Jang Song Thaek, whose execution for treason was announced by Pyongyang last week.
The killing of a man until now regarded as a regime stalwart has demonstrated that even family members are not safe - and prompted speculation about the fate of Ri, who regularly appears by her husband's side, but has not been seen in public since October.
As a recent edition of the Daily North Korean, a Pyongyang-watching newspaper based in neighbouring South Korea, put it earlier this month: "Why Has Ri Been Gone for 48 Days?"