The Death of Nicou was first published in The London Magazine in June 1770, with the signature 'C,' Brooke Street, June 12.  Can't find my copy of London, so here is the 2nd printing from the 1778 edition of Chatterton's Miscellanies in Prose and Verse, which derives its text from The London Magazine.  The two editions  differ only in some additional punctuation in the 1778.