def METHOD_NAME(text: str) -> Optional[Tuple[str, bool]]:
    """return image changed/deleted info from parsing the given system message text."""
    text = text.lower()
    match = re.match(r"group image (changed|deleted) by (.+).", text)
    if match:
        action, actor = match.groups()
        return (extract_addr(actor), action == "deleted")
    return None