"The right to choose your life partner or whom you associate with is a fundamental right, it is an integral part of the right to life," a bench of justices Gita Mittal and J R Midha said.
It also said that an individual's privacy of marriage and dignity are essential parts of right to life guaranteed under the Constitution and the view has been upheld in various judicial pronouncements.
"Honour killing is a class of offences by itself. Its motivation stemming from a deeply entrenched belief in the caste system, it is completely unacceptable. It needs serious examination as to why such murders are not categorized as separate offences in the penal provision," it said.
"The instant case manifests that even in a household belonging to the highest class in society, (one in which you can make day trips with friends from Ghaziabad to Mumbai just to celebrate a birthday, own multiple businesses and properties, luxury vehicle etc.) what can happen to even a young, educated, articulate daughter if she attempted to break away from the conventional caste confines and explored a lifetime alliance with a member of another caste. Especially one who was also perceived to be of a lesser economic status," it said.