two jurors said a vehicle , believed to be from whdh-tv , trailed them .
robert cusanelli told the court he made a ` mistake ' and acted on his own .
allegedly watched as the group got into their cars in an off-site parking lot .
insisted he did not take any pictures or speak to any of the jurors .
jury finished their deliberations thursday without reaching a verdict .
will return on friday as the ex-new england patriot player awaits his fate .