Let us follow the law.
"Now, under the law you must, in order to prove the crime of murder, be able to show the body of the victim; you must show that murder has really been done.

You must show a motive, a reason.

You must show, or be prepared to show, when required, a mental responsibility on the part of the accused.

All these things you must show by the best possible testimony, not by what you think, or what you have heard, but by direct testimony, produced here in this court.

You can't ask the accused man to testify against himself.