In the Line of Duty 4's Cast and Crew
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Full Cast
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Cynthia Khan
(Insp Rachel Yeung Lai-Ching)

Donnie Yen
(Captain Donnie Yan)

Michael Wong
(Captain Michael Wong)

Yuen Yat-Choh
(Luk Wan-Ting)

Lisa Chiao Chiao
(Luk's mother)

Wai Gei-Shun
(HK Police officer)

Yuen Shun-Yi
(Drug dealer)

Michael Woods
(Black fighter on rooftop/motorbike)

John Salvitti
(Fighter in alley)

Stephen Berwick
(Fighter on motorbike)

Fairlie Ruth Kordick
(Blonde fighter)

Paul Wong Kwan
(Killer at hospital)

Eddie Maher
(Loan Shark in Seattle)

Liu Kai-Chi
(Ming)