A man nabbed on the charges of killing his wife and his mother-in-law. 26-year-old Jagat Bahadur Khadka of Ruga-4 smashed an iron rod to his 26-year-old wife Naumati Khadka and his 45-year-old mother-in-law Oti Oli at the terrace. Both of them died on the spot, police said, adding that they are investigating the case.