A half-brother of North Korean leader Kim Jong-un was murdered Monday in Malaysia, according to multiple reports.

A South Korean government official said the murder of Kim Jong-nam — the eldest son of former North Korean leader Kim Jong-il — involved poison, Bloomberg Politics reported.

YTN television station reported that Kim Jong-nam was killed by two women using a poison needle at Kuala Lumpur International Airport in Malaysia.

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The incident was described as a "sudden death" by police, CNN reported.

Kim Jong-nam has in the past spoken out against his half brother, Kim Jong-un.

In 2012, he reportedly said his half-brother "won't last long" in power due to his inexperience.

The murder comes just days after North Korea conducted its latest ballistic missile test, firing a projectile into the sea just off the coast of the Korean Peninsula.

President Trump said during a news conference Monday he would deal "very strongly" with North Korea following the missile test.