Advertising firm Ogilvy & Mather has confirmed that one of its China employees, Li Yuan, has passed away suddenly at the age of 24.
Li was working at O&M China's Beijing office on Tuesday when he suffered a heart attack.
According to local news reports, the young employee had been working overtime every day for a month. News reports say he did not leave work before 11pm every night.
Colleagues who saw Li collapse to the ground had called for an ambulance, which took him to a hospital. He could not be revived.
At the time of Li's death, a doctor diagnosed Li to have suffered 'death by sudden cardiac arrest'.
Since news of Li's passing, Chinese netizens have flocked to his Weibo page to comment on the latest picture posted on his Weibo page.
The picture, believed to have been posted by someone who calls himself Li's 'ge ge' (elder brother), shows Li posing with a salute.
It was captioned: "Goodbye to the people I love, goodbye to the world".
It has since drawn more than 22,000 comments and has been shared thousands of times.