UCF Pay, a subsidiary of Chong Sing Holdings, was found to have embezzled client funds and had its operations suspended. The share price of Chong Sing fell by 88% in 2019, before trading was suspended in July. On 18 September 2019, Zhang died at Chelsea and Westminster Hospital in London, England, aged 48. UCF did not disclose the news until 5 October, and said the reason for the delay was because the company was "going through a special period of time". The causes of his death were multiple organ failure related to alcohol dependence and pancreatitis.