I have been wondering: How functional could "Jack" have been during and after the murders?
Some killers, who have already been less functional in society before their killings, tend to have a psychological breakdown along with their killings, which severely impairs their ability to interact normally with their relatives, neighbours and ultimately every other person they meet.
Some others like the Zodiac seem to be able to keep the appearances up and even refrain from killing for longer periods of time.
The question which really interests me after looking at the timeline of the canonical 5 victims: Is this 3 week gap between the first two and the last 3 victims a sign of the former or the later behaviour?
Could he have gone back to live his normal life and surpressed his urges for that time?
					Some killers, who have already been less functional in society before their killings, tend to have a psychological breakdown along with their killings, which severely impairs their ability to interact normally with their relatives, neighbours and ultimately every other person they meet.
Some others like the Zodiac seem to be able to keep the appearances up and even refrain from killing for longer periods of time.
The question which really interests me after looking at the timeline of the canonical 5 victims: Is this 3 week gap between the first two and the last 3 victims a sign of the former or the later behaviour?
Could he have gone back to live his normal life and surpressed his urges for that time?

 
) was a caring and jovial chap at home but once you asked him a medical question (he was a doctor but was too young to have worked in Whitechapel
) he was suddenly a very serious scholarly type that I barely recognised.  What could this mean?  Perhaps if JTR saw the killings as his work, he might be able to at least partly shut down that part of him when he was at home.   This hints to me what kind of professional he may have been eg a doctor (not a new idea I know) or an actor who was able compartmentalise himself into various roles.
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