The sad incident is said to have happened in the early hours of Wednesday morning in Berekum in the Bono region.
Reports suggest the crime was committed by a man identified as Kwabena Yeboah alias Kobii, who is currently on the run.
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It is unknown why the suspect shot Agyemang Badu sister but the police have taken up the matter.
The Black Stars midfielder, though, is currently in Italy where he plays for Serie A side Hellas Verona.