No fifth 'Lethal Weapon' for Gibson

Mel Gibson has ruled out ever starring in a fifth 'Lethal Weapon' movie.

The 56-year-old actor - who played LAPD detective Martin Riggs in all four 'Lethal Weapon' films from 1987 to 1998 - believes the franchise will be remade eventually, but he admits it will be "really tough" to replace Danny Glover, who plays Mel's onscreen partner Roger Murtaugh in the series.