Hyon Kwang-song is one of three North Koreans being sought, along with an employee of the state airline.
Malaysian police also confirmed Kim Jong-nam died after two women wiped a toxin on him at Kuala Lumpur airport.
North Korea’s embassy in Malaysia angrily denied the claims.
In a statement, the North Korean embassy said the fact that the substance was on the hands of the women proved it could not have been a poison and called for the immediate release of the “innocent females” and a North Korean man.
Speaking at a press conference in Kuala Lumpur on February 22, Malaysian Police Chief Khalid Abu Bakar said they were looking for three North Koreans in addition to the previously announced suspects.
One of them is Hyon Kwang-song, 44, the second secretary of the North Korean embassy in Kuala Lumpur.
The others are Kim Uk-il, 37, who works for Air Koryo, and another North Korean Ri Ju U.
Khalid Abu Bakar said they had written to the North Korean ambassador to Malaysia asking him to allow police to interview Hyon Kwang-song and the other suspects.
If the ambassador does not co-operate, “we will compel them to come to us”, he said, without giving details.
The police chief also said security had been stepped up at the morgue where Kim Jong-nam’s body is being kept after an attempted break-in earlier in the week.
Ten people have either been named as suspects or are wanted by Malaysian police for questioning in connection to Kim Jong-nam’s assassination.
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