When did AC DC lead singer died?

Excuse me, could you clarify the question a bit? Are you asking about the specific date of when the lead singer of the rock band AC/DC passed away? If so, I'm happy to provide that information. However, it's important to note that, as of my knowledge cutoff date, the lead singer of AC/DC, Brian Johnson, is still alive and well. So, there's no date of death to report at this time. Could you perhaps be thinking of a different artist or band member? If so, I'd be happy to assist with that as well.