Not sure where the sign is that one needs to read through a 17 page thread before making a comment Mr Stunt?
You didn't need to read the whole, it was discussed right at the start, and at several points since, it is all very simple.
1 - The man stabbed someone to death.
2 - It's reasonable to accept normally such action is murder.
3 - But, is there a defence? Well it appeared so, but it was one man's word, no CCTV, no witnesses, therefore:
4 - Man needs to be arrested to assist the police investigation, the i's need dotting & the t's need crossing, statements taken, scene searched, etc.
5 - A file of evidence so far then needs submitting to the CPS, IIRC within 24 hours** of arrest for murder when someone is in custody, for 'early investigative advice'.
6 - The CPS then decides if he is charged or not, and if he is what charge that should be, e.g. murder or manslaughter - that decision isn't one for the police, their role is only to carry out the investigation as quickly as possible.
** Just checked, it's actually within 24 hours 'wherever practicable'.
Specific cases involving a death, rape or other serious sexual offence should always be referred to an Area prosecutor as early as possible and in any case once a suspect has been identified and it appears that continuing investigation will provide evidence upon which a charging decision may be made.
Wherever practicable, this should take place within 24 hours in cases where the suspect is being detained in custody or within 7 days where released on bail.
Personally I am glad the investigation concluded support for the pensioner's version so quickly, so the CPS could make their decision in a speedy fashion, the man must have been so relieved to be told no further action will be taken within a fairly short period of time.
I just hope he & his wife receives as much support & help in getting over this, including protection against any possible revenge attack.