A Chinese gaming developer has been poisoned on Christmas Day.
Lin Qi, 39, was the boss at Yoozoo – best known for the Game of Thrones: Winter Is Coming game.
He was also a Netflix producer on The Three-Body Problem.
Shanghai police believe Mr Lin was murdered and want to talk to one of his colleagues.
They have named him as Mr Xu.
Mr Lin is worth £780m, according to the Hurun China Rich List.
Many employees and ex-employees gathered outside the Yoozoo’s office on Friday to mourn his death.
A company statement on its official Weibo microblog said:
“Goodbye youth, we will be together, continue to be kind, continue to believe in goodness, and continue the fight against all that is bad”.
The post attracted thousands of comments while the topic has been viewed more than 290 million times on Weibo.