According to police officials, Khan was strolling near his house when unidentified men on two motorcycles opened fire on him, killing him instantly.
Previous reports stated that he was wounded severely and was shifted to a hospital where he succumbed to his injuries.
The police and Frontier Corps (FC) surrounded the area and have begun a search for the assailants.
"He traced important cases and had received multiple threats from criminals in this regard," said a police source.
The police have constituted teams for conducting investigations.
Recently, a convoy of the Frontier Corps (FC) was targeted in a blast on Saryab Road in Quetta, killing two people and injuring 16 others.
Members of the Hazara community, United Nations (UN) workers and security personnel have also been targeted and killed in different incidents in Balochistan where the security situation is yet to be brought under control.
Many citizens abducted from different areas of the province also remain missing.
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