Nicholas Lyndhurst's wife, Lucy, has paid a beautiful tribute to her son Archie on Instagram, just a few weeks after his tragic death aged just 19. MORE: Nicholas Lyndhurst breaks silence following death of 19-year-old son Archie LyndhurstThe teenager passed away after a short illness, and Lucy wrote that they are still waiting for answers about how he died. Sharing an album of photographs on Instagram, he wrote: "It is with the heaviest heart that I write this post.