ITV Lethal Weapon Catch up on the ITV Hub TV show based on the popular 'Lethal Weapon' films in which a slightly unconventional cop is partnered with a veteran detective trying to maintain a quiet stress free level in life. 3 episodes available to watch Share this programme: Share on Facebook Share on Twitter Share on Google+ Series 2 Latest 13. Better Living Through Chemistry Fri Friday 20 Apr 9pm US action series. Riggs and Murtaugh investigate the murder of a patient of Doctor Cahill. 12. Diggin' Up Dirt Fri Friday 13 Apr 9pm Riggs visits his father-in-law in prison and learns an old secret. 11. Funny Money Fri Friday 6 Apr 9pm US action series. Riggs and Murtaugh get involved in the world of counterfeit money.