Club 27

Club 27 is the name given to a group of influential rock musicians that died at the young age of 27. There are a few "members" who are always listed in "27 Club" groupings - such as Jimi Hendrix, Jim Morrison and Kurt Cobain - while other musicians who were 27 at the time of their death are included sporadically, depending on who has composed the list (another term for this club-that-nobody-wants-to join is the Forever 27 club). Though the official causes of death vary between the different musicians - from suicide to overdoses on sleeping pills to, yes, choking to death on vomit - drug and alcohol abuse is often cited as a primary cause behind many of these deaths.

"The number of musician who passed away at 27 is truly remarkable by any standard. (Although) humans die regularly at all ages, there is a statical spike for musicians who die at 27" -- By: Charles R. Cross

Source:  
ranker.com
Wikipedia

Jim Morrison -- Death on 3 July 1971

Mia Zapata -- The Gits Band -- Death on 7 July 1993

Brian Jones -- Rolling Stones -- Death on 3 July 1969

Jimi Hendrix -- Death on 18 September 1970

Janis Joplin -- Death on 4 October 1970

Kurt Cobain -- Death on 5 April 1994

Amy Winehouse -- Death on 23 July 2011