According to police, Neelam alias Neelu (25), a resident of Jandwal village in Hoshiarpur, was allegedly having an affair with 35-year-old Murli.
The father of four, and a resident of Maluk Mattan village, was enraged when he got to know that Neelam's parents were marrying her to someone else.
He had approached Neelam, who was staying with her aunt in Sidhpur village, to continue their relationship, but she did not agree after which he murdered her by slitting her throat.
Later in the afternoon, Murli too consumed a poisonous substance and committed suicide, police added.