Story highlights Kim Jong Nam reportedly fell out of favor with his father over a trip to Tokyo Disneyland

He never met Kim Jong Un because of a practice of raising potential leaders separately

Hong Kong (CNN) The sudden death of North Korean leader Kim Jong Un's half-brother was murder, South Korean officials announced Wednesday.

Kim Jong Nam died Monday soon after becoming ill at Malaysia's Kuala Lumpur International Airport (KLIA) before an outbound flight to Macau.

Lee Cheol Woo, chairman of South Korea's National Assembly Intelligence Committee, told a press briefing Wednesday that Kim had been poisoned, and the suspects were "presumed to be two Asian females."

It's not clear how he obtained that information or how Kim was poisoned.

South Korea's Unification Ministry told CNN they were working with Malaysian authorities to get additional information.

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