I've been a prisoner and a healer.

I've made friends only to lose them.

I've taught and mentored.

I've been one person and another.

I've a brother, yet I never knew he exsisted.

My mind is gone, yet I am near genius.

When I died, I was no longer who I thought I was.

I am a man from the place of stars.

My potential exstinguished by greed and mandates.

You can have the key to my mind.

Who am I?