<Tr> <Th_colspan="2"> Audio </Th> </Tr> <Tr> <Th> Soundtrack (s) </Th> <Td> Lethal Weapon </Td> </Tr> <P> Lethal Weapon is an American buddy cop action comedy franchise created by Shane Black . It focuses on two Los Angeles Police Department (LAPD) detectives, Martin Riggs and Roger Murtaugh . The franchise consists of four films released between 1987 and 1998, as well as a television series which began airing in 2016 . All four films in the series were directed by Richard Donner and also share many of the same core cast members, while the television series recast the main roles with younger actors instead . </P> <P> Anxious with age and retirement, homicide detective Roger Murtaugh (Danny Glover) is partnered with young and suicidal narcotics officer Martin Riggs (Mel Gibson). Together, they work the case of the alleged suicide of Amanda Hunsaker, daughter of a wealthy businessman who served with Murtaugh in Vietnam . Murtaugh and Riggs soon discover that Hunsaker was involved in a heroin - smuggling scheme led by a retired general (Mitchell Ryan) and his lead enforcer (Gary Busey). </P>

How many series of lethal weapon were made
find me the text answering this question