
Authorities said they believe Umar Hayat murdered Ms Yousaf at her home in Islamabad on Monday after she rejected what they called his "offers of friendship". He allegedly also repeatedly tried and failed, to meet her.
They say he broke into her home, fired two shots, stole her phone and fled.
Ms Yousaf's father, Syed Yousaf Hassan, told the BBC she was his only daughter, and was "very brave".
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