I'm sure someone has already answered but all forms of social security benefits (for both disabled and retirees) are paid out on the 3rd of the month (so nope not the end of the month at all there) or if the 3rd falls on a weekend or holiday then whatever the last weekday before that is (so, as someone on social security disability, I've been paid on the first if the third was a Sunday or even sooner sometimes with Christmas and such). So no relation there.
Don't know about other benefits outside of disability and social security but assuming it's similar. 13th is a weird time to pay someone who, like those on disability or other government benefits, only get paid once a month.
That said, 13 is an interesting number. Some people find it very unlucky of course (there are buildings built without 13th floors. A hospital in my area doesn't have one!) but other folks love the number and even consider it lucky (if I'm not mistaken Taylor Swift is fond of the number, so just a random example). Maybe, if this was the same killer (so both happened on the 13th then? That's an interesting catch there) this is just a number they like? I don't really think it's pay related since most people get paid on Friday's and government benefits (in my state this is true also for food stamps, as well, and some other related financial benefits as far as I'm aware, but would be interesting to know what's that like in Indiana because some benefits are state based not national like disability or social security) are tied to a date not day of the week but seems to be beginning of the month. So barring some Indiana (or Iowa? That's where the other case happened, right?) I just don't think it's financially related.
Besides, these types of heinous folk have no qualms about killing innocent young women/ children so let's assume if they really needed or wanted to, they'd just steal any necessary supplies. They aren't operating under normal human morals or laws here so I somehow also don't think this type would be waiting for the money to go out and commit their double homicide!
Sent from my iPhone using Tapatalk