We’ve all know Oscar mike and Montana are the bestest of friends to the point they’ll have varesi killing competitions. But it shows that Montana had pet cats, this is a quote of Montana after reviveing, “the afterlife was awesome! all my kitties were there.”
But what happen to those kitties?
Well I have a thought that maybe that Oscar mike killed them (on accident of course). This thought happened with a part of a conversation in the DLC (Attikus and the Thrall Rebellion)
Aria: would fighting for your lives be a suitable catharsis?
Oscar mike: cat harness? No I just let them walk around, all eight of them!
This should mean that Montana occasionally let’s Oscar mike take care of his cats. So he probably took the cats on a walk without a harness like he usually does. And they somehow died, I can’t tell either they died regularly (eaten, touch something dangerous, etc) without him seeing or it being a varesi attack.