Tehreek-e-Labbaik Pakistan chief Khadim Hussain Rizvi has passed away in Lahore, sources within his family told Geo News.
According to the sources, Rizvi had developed fever when he participated in the party's sit-in in Islamabad and had not recovered from it.
The TLP leader was brought to Lahore's Sheikh Zayed Hospital at around 8:45pm, where he was pronounced dead, hospital sources dead.
They said that an ECG was also carried out to verify his death and that the attendants who brought him to the hospital "did not provide the patient's history" to the staff.
After his death was confirmed by the hospital, his body was transferred to a private hospital, from where it was taken to his residence, Geo News reported.
A large number of TLP supporters gathered outside at his residence in the Grand Battery Stop area on Lahore's Multan Road, where his body was brought back from the hospital.
Khadim Hussain Rizvi was born on June 22, 1966, and belonged to district Attock.
He studied Hifz and Tajweed from a Jhelum madressah and went on to complete his Dars-i-Nizami from Jamia Nizamia Rizvia in Lahore.
The TLP chief was a consequential figure in the political landscape of Pakistan for the past three to four years.
His party held a major sit-in in 2017 against the PML-N government. Subsequently, in the 2018 general elections, he obtained 2.2 million votes and Tehreek-e-Labbaik Pakistan emerged as the country's fifth largest party.
Prime Minister Imran Khan extended his condolences to Rizvi's family.
Reacting to the news, Chief of the All Pakistan Ulema Council Hafiz Tahir Mehmood Ashrafi said the death is a "tragedy" for the nation.
He expressed his condolences to Rizvi's family.
Minister for Religious Affairs Noor-ul-Haq Qadri also expressed regret over the death of the TLP leader.
"Pakistan has lost a great religious scholar and true lover of the Prophet (PBUH)," Qadri said.
"The services of Khadim Hussain Rizvi for Islam will always be remembered," he added.
Senator Faisal Javed Khan prayed for the soul of the deceased and for God to grant patience to his loved ones.
"Five arrested on MNA Asif's report, which alleges Awan of attacking his guest house," say police
President reiterates commitment to do whatever's possible for province's development
Police say "terrorists" received millions as funding in exchange of info, pictures gathered during recce
Reserved seats cannot be allocated to SIC and other parties would retain their seats, claims PML-N leader
It will be first visit of Prince Mohammed Bin Salman to Pakistan in five years
NCCIA established at a time when digital rights and privacy remain key issues, says PPP leader