Taiwanese leader William Lai Ching-te has said he is deeply saddened by the death of Hong Kong bookseller Lam Wing-kee, who publicly recounted being abducted and detained by mainland Chinese authorities in 2015.Lam died at the age of 70 after a years-long battle with lung cancer, according to Taiwanese media.Local reports said Lam, who moved to Taiwan in 2019, was admitted to Mackay Memorial Hospital in Taipei on Tuesday, but his condition worsened and he fell into a coma.He was pronounced dead on Thursday evening.Lam Wing-kee at his Causeway Bay Books in Taipei in April 2020. Photo: EPA-EFELast year, he disclosed that his lung adenocarcinoma had returned and advanced to stage four despite initial treatment.