Death Of Nau Nihal singh:

Nau Nihal was popular with the royal courtiers and the general public, and was seen as a worthy successor to his father during the latter's sickness. After Kharak Singh died on 5 November 1840, Nau Nihal performed his last rites beside the Ravi River in Lahore. After the ceremony, he started returning to the palace via the Hazuri Bagh, where a massive block of stone from a gate fell upon him and two of his companions. One of the companions - Udham Singh (nephew of Dhian Singh)- broke his neck and died on the spot.
According to Alexander Gardner, who was just steps behind Nau Nihal when the incident took place, the prince had sustained only minor injuries during this episode: he was well enough to walk on his own, and agreed to be taken on a stretcher only because of Gardner's insistence. However, when the court physician Johann Martin Honigberger came to attend Nau Nihal in a tent, he observed that the prince's skull had been crushed, and the bedsheet was covered with blood and brain tissue. Dhian Singh insisted that the prince had suffered these injuries during the alleged accident in Hazuri Bagh. Nau Nihal died hours later, although the courtiers did not make this news public until three days later in an attempt to avoid panic. According to Gardner, five artillery men had carried Nau Nihal from Hazuri Bagh to the tent: two of these men died under mysterious circumstances, two went on leave and never re-joined the service, and one disappeared without explanation.L.H. Griffin in The Punjab Chiefs says,"The only reason for the mystery which shrouded the death-bed of the Prince, was the necessity which Dhyan Singh felt for keeping the fatal news from being generally known until the arrival of Sher Singh. If there had been an organised plot, the Raja would have taken care that Sher Singh should have been present in Lahore at the time of the catastrophe. The absence of Sher Singh proves the innocence of the Raja (Dhian Singh)".
The contemporary English political correspondence, which details even the most insignificant happenings at the Darbar, makes no references to any suspicion entertained in any quarters regarding the Jammu Rajas. It has been asserted that as far as contemporary European writers go, it was their studied policy to denounce the Jammu Rajas, especially Dhian Singh, because of his anti-European attitude which he had consistently maintained throughout his career. On enquiry into the matter of the 'accident', J.M. Honigberger found "more reason to suppose that the partisans of Kurruck Singh and Chet Singh were the authors of this plot against the prince, as he had intended to ask them for an account of their perfidious behaviour during his father's long illness... He (the prince) to order seven of their houses to be closed and inquiries to be made".
Nau Nihal was cremated on 6 November 1840 at the age of 19. His mother Maharani Chand Kaur became the Empress of Sikh Empire assuming the title Malika Muqaddasa (immaculate queen). She was killed by poisoning her food on 11 June 1842.