Lethal Weapon 4 is a 1998 American buddy cop action comedy film directed and produced by Richard Donner, and starring Mel Gibson, Danny Glover, Joe Pesci, Rene Russo, Chris Rock, and Jet Li (in his American film debut). It is the fourth and final installment in the "Lethal Weapon" series.
Jet Li only starred in the fourth installment of the Lethal Weapon series. 
Lethal Weapon 4 was Jet Li's American film debut (his first American film), so he couldn't have starred in the first 3 versions of the American film series. 