The founder of Yoozoo Games, Lin Qi, passed away on Christmas Day after eight days in hospital suffering "acute symptoms of illness." Now the Shanghai police have revealed that poison may have played a part in Lin's death and have detained a colleague who is suspected of being involved, the Guardian reports.

Yoozoo Games is a Shanghai studio best known for Game of Thrones strategy game Winter is Coming. Yoozoo is also set to produce the upcoming Netflix adaptation of the Three-Body Problem, which has Game of Thrones showrunners David Benioff and D.B. Weiss attached.

According to reports from the Shanghai police, the hospital determined that Lin had been poisoned. The police have detained a suspect with the surname Xu, who allegedly worked with Lin at Yoozoo Games. The police statement only said that Xu was a suspect, who was being detained "in accordance with the law while the relevant investigative work is carried out."