That only applies if you're the defendant.

If you're the witness to a murder and you're subpoena'd to court and refuse to testify then you are committing contempt of court. There was a guy in Illinois who got 20 years (reduced to 6 on appeal) for refusing to testify in a murder.

https://illinoiscaselaw.com/clecourses/contempt-of-court-max...

Contempt of court usually has no boundaries on the punishment, nor any jury trials. A judge can just order you to be executed on the spot if you say, fall asleep in his courtroom. Sheriffs in Illinois have the same unbridled power over jail detainees.