Does pacemaker beep or signal patient when dying?

Yes it does.: Often this means you he reached ERI of the pacemaker. It needs to be interrogated immediately.

Many but not all: Typically implanted defibrillators will beep and some will also vibrate when the battery runs down to the point it needs to be changed. Some but not all pacemakers will do the same. The key is not to miss your routine pacemaker follow up appointments to avoid any surprises with low battery issues