The 2 INTJs I know, as a general rule, aren't even aware they're 'death staring' in the first place. They just sort of switch off to the outside world and death stare at whatever their heads are pointing at. If its in the middle of a conversation, people generally get scared and then make an excuse to leave - it's the funniest thing to watch.
Try and snap them out of the stare by asking them a directed question and it's generally followed up by the 'deer in the headlights' look.
Try and snap them out of the stare by asking them a directed question and it's generally followed up by the 'deer in the headlights' look.