Miggs is dead.
3 seconds sound clip from the The Silence of the Lambs movie soundboard.
You can hear this line at 00:21:57 in the Blu-ray version of the movie.
Quote context
[...]
- Clarice. Phone. It's the guru.
- Sir.
- The orderly heard Lecter whispering to him all afternoon and Miggs crying.
- They found him at bed check. He'd swallowed his own tongue.
[...]