I suspect the agreement can be dropped by either side,at the point it was at . By fleeing, I suspect the plea is null anyway. If this is so, all the former charges could be faced again in court....plus the fleeing charges plus possibly others related.    In most locals in the USA,at that point, a plea, or any information supplied to the prosecution would be inadmissable. But any new information supplied to enforcement, or other new information, such as public comments, could possibly be admissible in court....if it went that way.