Detective Investigation Files III
Detective Investigation Files III is a 1997 TVB production. It was a direct sequel to Detective Investigation Files II and the third installment in the Detective Investigation Files Series. The series ran for 40 episodes. Only Michael Tao, Joey Leung and Kenix Kwok returned to reprise their roles from the previous two installments. Louisa So, Amy Kwok, Joseph Lee and Sammi Cheng did not participate in this series; instead they were replaced by Margaret Chung, Law Koon Lan, Liu Kai-chi, Monica Chan and Winnie Yeung who portrayed new characters. This installment featured 10 cases.
Cases
Case 1: The Other Jessie (Episode 1–5)
| Actor | Role | Description |
| Patrick Tam | Ho Chi Wan | Stephen、何醫生 Doctor Ning Qian Hua's boyfriend Murdered Tony and tried to murder Jessie Sentenced to death in episode 5 |
| Kenix Kwok | Ko Chit | See Main Cast |
| Kenix Kwok | Ning Qianhua | Vivian、阿倩 Originally from Guangzhou Ho Chi Wan's girlfriend Switched identities with Jessie and escaped to Hong Kong Sentenced to death in episode 5 |
| Eric Li | Law To Fung | Tony、羅醫生 Doctor Ho Chi Wan's friend Murdered by Ho Chi Wan in Beijing in episode 1 |
| Leung [Kin Ping] | Wang Haosheng | Blackmailed Gary Shek and Ning Qianhua Murdered by Ning Qianhua in Beijing in episode 1 |
| Lan Tianying | Lan Qing | Blackmail Gary Shek with Wang Haosheng Arrested in episode 2 |
| Emotion Cheung | Gary Shek | Blackmailed by Wang Haosheng and Lan Qing in Beijing |
| Wu Suqin | Fu Zhaohong | Cheung Tai Yung's friend Qiao Jin's mother |
| Tu Ling | Jiang Yang | 楊楊 Qiao Jin's wife |
| Ronnie Ching | Qiao Jin | Cheung Tai Yung's friend Fu Zhaohong's son Beijing's Gong An |
| Lu Wanfen | Ding Miao | 小苗 Beijing's Gong An |
| Shen Xingming | Zhu Jin | 小朱 Beijing's Gong An |
| Zheng Ruixiao | Chai Jun | 小柴 Beijing's Gong An |
| Melissa Ng | Yu Xiaoyu | Ko Chit's Lawyer |
| Wong Tai-wai | Zheng Guoping | Mainland Lawyer |
Case 9: The Precious Stone (Episode 32–37)
Case 10: Backstage Manipulator (Episode 37–40)
| Actor | Role | Description |
| Kam Hing Yin | Jim Pak Hung | 詹Sir Chief Inspector Jim Chui Yi's father Manipulated the events of Case 5, 7 and 9 Arrested in episode 40 |
| Wilson Tsui | Wu Kin | Chak Wing Tin's good friend Killed Ching Sau On Kidnapped Fong Sung Yip and Lee Sze Lung Conspired with Chan Tai to extort Johnson Stabbed to death by Johnson |
| Yau Man Seng | Chan Tai | Wu Kin's partner in crime Killed Ching Sau On Kidnapped Fong Sung Yip and Lee Sze Lung Conspired with Wu Kin to extort Johnson Shot and killed by Johnson |
| Celine Ma | Helen | Wu Kin's girlfriend Shot and killed in the back by Johnson |
| Monica Chan | Pak Yan Tung | Cheung Tai Yung's classmate and ex-girlfriend Poisoned to death by Johnson |
| Simon Sit | Sun Keng Do | Village tramp and witnessed Johnson's crimes Fell to death after being pushed by Johnson |
| Chiu Shek Man | Chou Sir | 周Sir Superintendent Johnson's superior Accidentally poisoned to death by Johnson |
| Liu Kai-chi | Chak Wing Tin | 田哥 Cheung Dai Yung's subordinate Deborah's lover, later husband Grievously hurt by Johnson in episode 38 |