Santhosh was found dead under mysterious circumstances at Coorg in Karnataka, recently.
Viswanathan was assaulted by a group of persons at the waiting room at the hospital accusing him of theft.
Viswanathan was found hanging with bodily injuries on the Kozhikode Government Medical College premises.
Manorama News reported that the CCTV visuals show 12 people around Vishwananthan at the time the family alleged he was beaten up.
The Wayanad MP, who reached the Kozhikode airport on Sunday night, visited the house of Vishwanathan in his district this morning.
While it was first reported Vishwanathan died by suicide, police have now changed it to unnatural death.
Attappady has, in its cold air and calm tenor, two versions of the lynching story. An outsider can either take sides, seek the truth, or get lost in the vortex of the differing narratives.
'I lost my son. They can’t quote a price for him. To me, my son is much more valuable than the huge mansion they offered,' says Madhu's mother Malli.
Madhu's mother and sister now want the special prosecutor, advocate C Rajendran, to be replaced. Rajendran is the third public prosecutor handling the case after two senior lawyers opted out.
Madhu's sister Sarasu said her family is facing a serious threat as they have been fighting relentlessly to get justice for her brother.