I believe it was on Hallmark or Lifetime
A sister is searching for her brothers killer. No one knows she is the sister until a man sees the same birthmark on her shoulder in the shape of a heart that her brother had. The killer was a woman named Simone (I believe) and she had a baby with him that had the same birthmark on his ankle and she killed the brother to keep that secret. This all happened on a ranch.
This is such a good movie please help me!