The shooting came as a group of Ahmadis were gathered for worship at a home in the district of Sanghla Hill, local police chief Malik Shamshair said.
Police have arrested the main suspect, Shahid, and raids are being conducted to arrest the other culprits.
Professor Naeem was returning home after work when the assailants ambushed him in Bhana Mari area in interior Peshawar city on Monday, they said.
According to a police statement, husband Mehrab Gichki took Shaheena Shaheen Baloch's body to a hospital in a car, but fled soon afterwards.
The killers fled the scene after committing the crime, police said, adding that the reason behind the murder is not yet known.
The accused Jehanzeb Surkheli killed his two wives, daughter, son and daughter-in-law after a fight over a petty issue in KPK's Batagram district.
Zabiadullah Dawar, who was posted as the Director of Pakistan Housing Society, was on his way home in North Waziristan after Eid prayers along with his two cousins at the time of the attack.