Conversation so far:
When was Mielke imprisoned?
1989.
What crime was he convicted of?
ruling that Mielke was not mentally fit to stand trial.
How long was Mielke imprisoned?
1,904 days.
What happened during his imprisonment?
Mielke enjoyed having imaginary conversations with non-existent Stasi agents.
Are there any other interesting aspects about this article?
[Mielke's] bank account, which held more than 300,000 marks (about US $187,500), was confiscated.

Question: What did Mielke do after being released from prison?
Self-contained rewrite: What did Erich Mielke do after being released from prison?