True.
But I'm not convinced this is completely disorganized. Random/opportunistic, sure, but I get the sense this guy (I'm assuming it's a man) put at least some thought into how to avoid getting caught.
I'd call it more semi-organized, in some ways similar to those trail murders in Kansas City (and, if I remember correctly, they found out after the fact that guy had committed an earlier murder on a bus rider right as they got off the bus, after which he switched to more "secluded" areas on the trail).
Although they may just be keeping this out of public knowledge, they haven't mentioned ballistics matching between the victims, which suggests the possibility that different guns were used in each murder. And, IF the figure in the released video is in fact the suspect, the fact that he took off running on foot but slowed down to walking prior to getting out of the neighborhood, suggests that he had probably gotten rid of the gun prior to slowing down.
IF he used different guns that is definitely to me a sign of at least some degree of organization (and, incidentally, was what happened in the aforementioned Kansas City murders.)
But again, I'm just throwing darts here and could be very wrong. Hell, if there's no ballistics match, it's not inconceivable that Monica's murder is totally unrelated to the other two (although to be clear I do think they are all related).