Is it the right question? It seems like almost all laws have abortion law and murder laws meeting at the point where the embryo or fetus reaches the point where it can survive outside the uterus. The legal test used is commonly a viability test, and current medical technology sets that to week 22. Abortion is thus usually not allowed after week 21. A murder is thus any intentional death after the date where abortion is no longer legal.

It does however get a bit complex at times. Here in Sweden there has been some discussion what to do with delays in abortion caused by the hospital. The result of the discussion was to determine viability based on the initial date that the decision to have an abortion was registered. The argument is that the treatment women go through to have an abortion makes the embryo/fetus less viable, thus making it still legal to have an abortion in those cases beyond week 22.

From a philosophical perspective I see the viability test as being a unfulfilling answer to both side of the political space, but it seems like the best approach from a practical perspective.

The very fact that it's allowed suggests heavily it's not murder; our green-coloured chum's statement is inherently contradictory and as such cannot be sensibly addressed.