Hollywood tracking board TrackingB.com reports that Shane Black, who wrote the first Lethal Weapon movie, has written a spec script for Lethal Weapon 5 without telling anyone. The site adds that he contacted franchise producer Joel Silver and said that he wanted to continue the story.
This time, homicidal Riggs (Mel Gibson) is about to retire, but pulls Murtaugh (Danny Glover) out of retirement to solve one final case, before they both officially head off into the sunset.
TrackingB.com says that Gibson and Glover are down to return, but no deals have been signed.
The first film was released in 1987, the second in 1989, the third in 1992 and the fourth in 1998.