First of all, the headline is made to be short. The use of colon after the phrase “Kim Jong-nam death” shows that the text after the colon is an update or related case to the text on the left side of the colon.
The headline states the what, who, and where. The lead makes the female suspect as the subject to assert the focus of the article on her instead of Kim Jong-un half brother’s death.
One thing to improve on, is the lack of original sources. The article mentions it got some information from South Korean media, I suppose its credibility would rise up if they put a hyperlink to the original South Korean media.
There is also the very helpful “What happened?” and “Who was he?” sections. They help the new readers who haven’t known about anything related to this murder.