Srinagar, May 11 -- Jammu- In a tragic development in the Kathua murder case, the younger brother of the slain youth has succumbed to his injuries at AIIMS Jammu, officials said on Monday.

The deceased, identified as Nikhil Singh (16), died late Sunday night while undergoing treatment for critical head injuries at AIIMS Vijaypur, reported news agency KNO.

The assault had already claimed the life of his elder brother Nakul Singh (18) earlier this week.

Police have arrested 19-year-old Parth Verma alias Sumit in connection with the case.

According to investigators, the accused allegedly killed Nakul inside his house in Ward No. 10 of Kathua on May 6, following an argument over a suspected love rivalry.

Police said the accused, a friend...