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However, according to new United Nations report the murder in Malaysia would be just the tip of the iceberg of a huge criminal network set up by Pyongyang to bypass international sanctions.
Through a network of front companies North Korea is "flouting sanctions through trade in prohibited goods, with evasion techniques that are increasing in scale, scope and sophistication," according to a report prepared for the UN Security Council and acquired by CNN.
The report said it would be published as a Security Council document by 22 February "in the absence of any objection," but it has not yet been made public.
UN investigators have documented trade in "hitherto unreported items such as encrypted military communications, man-portable air defense systems, air defense systems and satellite-guided missiles" in Asia, Africa and the Middle East.
The UN criticized member states for failing to fully enforce sanctions.
Sanctions
North Korea is also prohibited from trading in small arms and light weapons ammunition, and certain minerals and metals. The UN encourages member states to destroy any materials suspected of breaching violations.
However, according to the new report, Pyongyang has been bypassing these restrictions for years, via numerous front companies and international facilitators, paid for in cash or gold.
"Diplomats, missions and trade representatives of (North Korea) systematically play key roles in prohibited sales, procurement, finance and logistics," the report said.
"Despite strengthened financial sanctions in 2016, the country's networks are adapting by using greater ingenuity in accessing formal banking channels, as well as bulk cash and gold transfers."
North Korea's embassies to the United Nations and Malaysia did not respond to multiple requests for comment.
Arms smuggling
In August last year, Egyptian officials intercepted a North Korean ship, the Jie Shun, en route to the Suez Canal.
Underneath several large tarpaulins piled with iron ore, they found a huge secret cargo of ammunition, including around 30,000 PG-7 rocket-propelled grenades and related equipment, the UN report said.
Markings on the weapons and crates indicated they had been manufactured in North Korea, and then disguised as "assembly parts (for an) underwater pump," it added.
Around 45 boxes of military communications equipment sent from China to Eritrea were seized. All bore labels from "Glocom," a shadowy company purportedly based in Malaysia which specializes in radios and other gear for "military and para-military organizations," the UN report said.
Glocom
As of 2014, the company claimed it employed more than 50 engineers and other staff members from its headquarters in Kuala Lumpur's Brickfields area, known for its Indian food and Buddhist temples.
But a visit by CNN to the company's offices ended at an unmarked, locked black door in a shabby, poorly-maintained corridor.
Malaysian police said Tuesday that "no company by the name of Glocom exists." The company's website was registered by International Global Systems (IGS), which police said was in the process of being struck off the Malaysian business register, along with sister firm International Golden Services.
The Malaysian Foreign Ministry did not respond to requests for comment regarding North Korean companies operating in the country.
Pan Systems
IGS and Glocom, the UN said, are fronts for Pan Systems Pyongyang, a North Korean firm engaged in procuring and marketing arms-related material.
Pan Systems Pyongyang used an extensive network of agents, companies and offshore bank accounts in China, Indonesia, Malaysia, Singapore and the Middle East to bypass sanctions, according to the report.
The report claimed Pan Systems Pyongyang is operated by the Reconnaissance General Bureau, North Korea's "premier intelligence agency."
Pan Systems, Glocom and IGS did not respond to requests for comment.
A representative for Pan Systems in Singapore denied that their organization had any association with the Pyongyang firm.
Three North Koreans arrested in 2014 and accused of attempting to smuggle around $450,000 in cash out of Malaysia "identified themselves as representatives of Pan Systems Pyongyang" and claimed the money belonged to the North Korean embassy in Kuala Lumpur, according to the report.
Malaysia's Attorney General eventually chose not to press charges because of insufficient evidence.
"Stronger sanctions have led networks of (North Korea) to employ greater ingenuity in using formal banking channels and bulk cash transfers to facilitate their illicit endeavors," the UN report said.
"Despite strengthened financial sanctions in 2016, the country's networks are adapting by using greater ingenuity in accessing formal banking channels, as well as bulk cash and gold transfers."
Investigators said both North Koreans and foreign agents were active in many countries, including top global financial centers.
CNN's Elizabeth Joseph, Pamela Boykoff and Richard Roth contributed reporting.