Well, quite possibly, I don't know. You would certainly have the skills and potential to be a piano player. You can't take back your previous piano-playing, it still happened and you can't deny it.
And some people are naturally born being truly excellent piano players with little help; for the rest of us, we are inclined to not so be great at playing the piano unless we have 1. actually seen/heard pianos, and 2. have grown up in an environment in which piano playing was taught and encouraged.
So I would say that some people have a natural affinity for playing the piano, right? But for most people it is learned. And all of us have the potential to be excellent piano players, unless we are born with some trait that makes it impossible.
(Substitute "murder" or something really awful for "piano playing", same thing. Assuming murder requires skills, desire and aptitude, which I'd imagine it does. Some people will be better at it than others and some people will willingly practice it more than others.)
Oops. I just made this about nature vs. nurture. Well, we know the answer to that is "both", right?
Oh, yes, and one more thing: I bet you get better at it over time, the more you practice it, whatever it is, murder, piano, anything.