Name this dead icon

My friend John H. enumerated something I was thinking last night. See if you can figure out who he's referring to.

Name this person:
- Child star
- Early fame makes their life very difficult
- Stars in movie version of the Oz story
- Becomes a cult figure
- Cannot seem to get out from under the yoke of crass promoters
- Suffers from two decades of bad publicity
- Dies abruptly around the age of 50 under suspicious, drug-related circumstances
... while preparing for a series of comeback concerts in London
- Leaves behind three children
- Death causes outpouring of public grief.

You were thinking Judy Garland, right?


Or how about Michael Jackson?


One and the same? HMM!