Some local media said ul-Haq was in the neighbouring city of Rawalpindi when he was shot and killed.
"He was resting in his room. When he returned, he found Maulana Samiul Haq dead in his bed and his body covered in blood", Sami s son said.
He was regarded as the "Father of the Taliban" because of the relationship between a student (Talib) and Teacher is a relationship of Father and Child, and had close ties to Taliban leader Mullah Mohammed Omar.
A spokesman for the military condemned the "assassination" and expressed "grief and condolences" to his family. Maulana Sami was a heart patient, Hamid said.
The prime minister has sought a report and directed that an investigation be carried out immediately to find those responsible.
Earlier, some reports suggested that gunmen on motorbikes opened fire on Samiul Haq's vehicle and sped away.
Minister of State for Interior Shehryar Afridi has also condemned the assassination.
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The intense gunfire also reportedly injured Haq's driver and guard.
Speaking to ARY News, the deceased's son Hamid ul Haq said his father was stabbed to death at his Rawalpindi residence. There he studied fiqh, usul al-fiqh, Arabic literature, logic, Arabic grammar (sarf and nahw), tafsir, and Hadith.
Maulana Samiul Haq was a religious scholar and former Senator.
He headed a political party and was twice elected as member of the Senate, the upper house of Pakistan's parliament.
DW interviewed Haq in 2015, during a visit to Haqqania.
Maulana Samiul Haq was also the leader the Darul Uloom Haqqania religious seminary and was openly supporting the Taliban-led insurgency in Afghanistan.
In a statement, he said Maulana Samiul Haq's political and religious services will be remembered.