As best I know, nobody on SS has yet to livestream his own suicide either by sodium nitrite or any other method. However back in May a 25 year old woman named Shawn Shatto who was a member here ingested SN and kept posting in real time until she passed out and died.
Her mother found her body with her computer still logged into the daughter's SS account. Afterward she went ballistic on Facebook and contacted the local media and police, blaming SS for her daughter's death which brought a lot of bad publicity to the forum.