Another sad and unnecessary incident for the Negative Outcomes database.
Texas maintenance worker checking pipes killed after he was mistaken for intruder
https://www.foxnews.com/us/texas-maintenance-worker-checking-pipes-killed-after-mistaken-intruder
The resident, mistakenly believing his apartment was being burglarized, grabbed a gun and shot Montelongo through the window.
The only element of the Can May Must Should paradigm http://modernserviceweapons.com/?p=19028 that was fulfilled was CAN. There’s a good chance now that the shooter will end up doing time in prison.
Serious Mistake and Negative Outcome
To paraphrase ‘the great Morpheus’:
tacticalprofessor 
That was a stunningly bad decision making process. I hope the shooter rots in prison.
On one hand the resident made a judgement error that proved fatal for the pipe checker. Damn shame. On the other hand, a one shot stop. In a Fair World he should be sentenced to life in prison, training LEO’s pistol marksmanship.