Trayvon Martin Juror -- George Zimmerman Belongs in Prison

How's this for irony ... George Zimmerman belongs in prison ... this, coming from one of the jurors in the Trayvon Martin case who kept him OUT of prison.

Juror B29 -- who identifies herself as Maddy -- tells TMZ, she always had a bad feeling about Zimmerman, despite finding him not guilty of murdering Trayvon ... a verdict she begrudgingly reached through a strict interpretation of the law.

Now, she says Zimmerman's domestic violence arrest is proof he's not freedom-worthy ... "God is showing George's true side ... [George] is continuing to dig himself a bigger grave."

The juror believes Zimmerman will continue to commit violent acts until someone lays down the law ... telling us, "He NEEDS to do some type of time ... He thinks he is invincible."