I have no doubt a cheque was written then but I have doubts on how somebody killed a family of 4 in such a short space of time. The car was pulling in at 7.47 pm ( if this is wrong please let me know) so then park up , turn the engine off, get out of the car and either knock on the door or did Chase use the open window to try and get in. So then that’s probably 7.49pm by this stage dependant on how he got in. Even later if he had to crawl in though a window and not be heard.
So he has 10 minutes give or take to kill a family of 4 and then start writing out a cheque. At the moment that doesn’t add up to me imo
It sounds totally implausible that he could of pulled that off in that time frame.
ETA - I had forgotten to add Joey was very badly beaten as well. He had a broken a leg and Rib so again that took time.
I don't have answers to any of this right now - only what i was able to pull together from the Prosecutions opening. I also don't know exactly what kind of cloud service QB was in 2010 - but with cursory checking it seems QBO (Quickbooks online) was around back then. Although its nearly a decade ago, cloud stuff was already a big deal for a while - e.g. Salesforce
So the key point I take from the opening is that multiple computers could access McStay's QBO accounts - so that implies a cloud account rather than desktop. The access revealed by the prosecutor were from the McStay computer at home, the McStay laptop, and then seemingly someone from another computer using McStays login.
McStay himself accessed his QB account on the road on the 4th in between calls to his bank.
The problem about this for the defendant is that a cloud service will typically log information for each and every login for security purposes. Especially for financial services like Quick Books and online banking.
Logged info would typically be User ID, IP address, Machine ID, Operating System and Browser type and version (at least if it was browser based)
This is apparently a huge issue for the defendant.
For example, given he cashed more than one of the deleted cheques and made the call to Quickbooks to delete account - it can't be seriously denied that he is the person that was making them.
So this piece of evidence would appear to definitively place him in the McStay home at 7.56 pm on the 4th
That blows his alibi sky high