An online story first made the suggestion by listing similarities between the lines spoken by Matthew McConaughey's True Detective character Rust Cohle and Ligotti's work.
Pizzolatto, who is a nominee for writing the episode 'The Secret Fate of All Life', however, said the lines were inspired by philosophers like Arthur Schopenhauer, Friedrich Nietzsche and E M Cioran and these ideas are not exclusive to any author, reported Deadline.
"Nothing in the television show 'True Detective' was plagiarized... As an autodidact pessimist, Cohle speaks toward that philosophy with erudition and in his own words. The ideas within this philosophy are certainly not exclusive to any writer," Pizzolatto said in a statement.
"Philosophical concepts are free for anyone to use, including writers of fiction, and there have been many such examples in the past. Exploring and engaging with ideas and themes that philosophers and novelists have wrestled with over time is one of the show's many strengths - we stand by the show, its writing and Nic Pizzolatto entirely.
'True Detective' is a big contender at the Emmys with 12 nominations.