On Tuesday night, gunmen shot at Geo TV's news van in Karachi, killing a technician and injuring the driver.
A journalist with national broadcaster PTV was also seriously injured when he was shot in an attack in Peshawar.
Police said the motives behind the shootings were not immediately clear, the BBC's M Ilyas Khan in Islamabad reports.
Aftab Alam was on his way to pick up his children from school when he came under attack from gunmen on a motorcycle.
He had most recently worked for another leading Urdu-language TV news channel, Samaa, but was not currently employed in the profession.
Pakistan's financial capital has seen a spate of attacks on the media.
Aftab Alam: Second Pakistan media worker shot dead in Karachi - BBC News