POLICE SOURCE: Missouri police officer was badly beaten before shooting Michael Brown.

Wilson suffered a fractured eye socket in the fracas, and was left dazed by the initial confrontation, the source said. He is now "traumatized, scared for his life and his family, injured and terrified" that a grand jury, which began hearing evidence on Wednesday, will "make some kind of example out of him," the source said.

He should be terrified, now that Attorney General Eric Holder is on the case.

UPDATE: with the assistance of Missouri Gov. Jay Nixon.