I am sure that most of us remember that we have already, severald times, discussed the weapon. I haven't seen any new developments.
Except for one very unusual exception, that I'm not going to bother to go into, silencers cannot be used on revolvers.
I have never seen it stated by LE that a 22 revolver was used. If I missed this, please give a source for your statements.
We don't know for a fact what the ammo was, nor do we known much about the revolver.
I certainly agree this was not a "professional" but I disagree that a professional would have used a 9mm/40/45
if the plan was to shoot her at such close range, especially if both of them were standing up. I won't describe what the consequences could be for several head shots. It appears that the shooter had 2 reasons they needed to get close to Liz, to verify she was the right person and to show or give her something. So the weapon and ammo could have been a decision based on that. The very delberate last shot to the face, tells me that the shooter may have known the "best" place for the ammo used.
The idea the shooter using only one hand indicates inexperience is not necessarily true. He/she was holding something in their left hand, which they showed to Liz, after they had already pointed the gun at her. They may have been confident of controlling recoil their aim at such a close range. They shot immediately after showing something to Liz. I have often done drills shooting a number of guns with only one hand, it's a common shooting exercise.
There is a misunderstanding of what is said by the detective in the linked broadcast. At 5:16 he is asked what kind of gun was fired, he answered that one round was recovered, small to medium size caliber,
possibly a .380. If he is talking about the ammo, as it sounds, it cannot be claimed a .380 revolver is the gun that was used. The recovered round does not identify the bullet or the gun type that was used. He said "Possibly". My opinion is, as a member of LE, the detective has heard something (he did not do the ballastics/examination of the recovered evidence) and doesn't know any facts.
I do not think that any of this information alone, could or should have led to this being solved.
Edit to add
A planned evert would mean knowing the exact address already, you don't case a bank the day of the robbery.
You use a different car and drive around a number of times, way before the event.
Moo
https://www.investigationdiscovery....igation-discovery-atve-us/a-fairy-tale-ruined