A former editor of The News daily, Haroon started her career with the Frontier Post. She later joined The Nation and worked in editorial positions in various media organisations in Lahore and Islamabad.
In 2007, she joined The News as its editor in Lahore.
After being diagnosed with cancer, she initially received treatment at Shaukat Khanum Hospital in Lahore before being taken to Mount Sinai Hospital in New York.
After prolonged treatment, she was on her way to recovery when the disease recurred in June last year.
Haroon's death was mourned by journalists in Islamabad, Lahore and Karachi on Sunday.
Her husband Faisal Bari is a professor of economics at the prestigious Lahore University of Management Sciences.