TT #51 · Parashas Noach · Fourth Aliyah · Passuk 9:6
Whoever sheds the blood of man, by man shall his blood be shed, for in the image of God He made man.
Torah Temimah points to the inclusion of a Bat Noach who kills (Sanhedrin).
E-Daf image — Sanhedrin 57b (size=3)
English: “Whoever sheds the blood of man” — and even a daughter of Noach who kills is executed; although it is written “of man,” it is also written “whoever sheds the blood of man” — in any case.
Custom (inclusion of women under the Noachide murder prohibition).
The prohibition and capital liability for murder apply to both men and women among the Bnei Noach.