Would you give the nod to pull the plug on a parent's ventilator?

A terminally ill parent living away from you has been in and out of intensive care and has been given not too much longer to live. In a quick turn of events, things went downhill and patient is now determined to be clinically dead and only breathing with the help of life support.

While making travel plans, would you rather let the patient rest in peace now or keep life support in place to see the patient breathing until the dying moment?

BTW, the patient has no known legal Living Will.