In 6 BCE, Empress Dowager Fu would further display her power and at the same time cause the people to be even more disappointed in Emperor Ai. Emperor Ai's cousin Liu Jizi (劉箕子), the Prince of Zhongshan (Prince Xing's son), had a congenital heart disorder, and his grandmother Feng Yuan, the princess dowager, cared for his treatment and often worshipped gods to pray for his healing. Emperor Ai, up on hearing his cousin's illness, sent imperial physicians along with his attendant Zhang You (張由) to go to Zhongshan (roughly modern Baoding, Hebei) to treat Prince Jizi. Zhang, however, was himself afflicted with a psychiatric condition (probably bipolar disorder), and when he got to Zhongshan, he suddenly, in a rage, left there and returned to Chang'an. Once he did and was ordered to explain his conduct, he made up a false reason—that he had discovered that Princess Dowager Feng was using witchcraft to curse Emperor Ai and Empress Dowager Fu. Empress Dowager Fu and Princess Dowager Feng were romantic rivals when they were both consorts to Emperor Yuan, and Empress Dowager Fu decided to use this opportunity to strike at Princess Dowager Feng. She sent a eunuch, Shi Li (史立), to serve as investigator, and Shi tortured a good number of Princess Dowager Feng's relations (including her sister Feng Xi (馮習) and her sister-in-law Junzhi (君之)), some to death, but still could not build a solid case against Princess Dowager Feng. Shi Li decided to show Princess Dowager Feng who was actually behind the investigation, by referring to an incident in which then-Consort Feng defended Emperor Yuan against a bear which had broken loose. Princess Dowager Feng, realizing that Empress Dowager Fu was behind the investigation, went back to her palace and committed suicide. In total, 17 members of the Feng clan died as a result of the investigations. This was immediately viewed as a political case, and officials and the people all became disappointed in Emperor Ai.