derek medina*Facebook members probably never thought they would unwittingly made witnesses to a murder.

Derek Medina, 30, took a picture of his wife’s lifeless body (see photo HERE) and posted it to Facebook after he shot and killed her.  Unbelievable, right?

Even more chilling,  commenters left messages that read “What happened???? derek” and “That is my friend there. jennifer Alfonso.”

According to reports, he confessed to the crime both by cell phone and on his Facebook page.