The 51-year-old businessman was stabbed multiple times by the accused on Sunday in west Delhi's Moti Nagar. He succumbed to injuries the next day. The victim's 19-year-old son, who tried to rescue his father, was also stabbed and is battling for life.
"It was an unfortunate incident and religion must not be brought into it. Some political forces are trying to give religious colour to the incident, but that is unacceptable," senior Aam Aadmi Party (AAP) leader Sanjay Singh said.
He said his party would give full support to the victim's family.
If the Delhi Police do not probe the incident properly, then Delhi Chief Minister Arvind Kejriwal and other senior AAP leaders would hold a protest, he added.
Singh was accompanied by Madipur MLA Girish Soni, in whose constituency the incident took place.
Soni accused the "BJP-RSS" of trying to give religious colour to the incident.
Singh said he and Soni would be meeting the victim's family.
A 45-year-old man and his 20-year-old son have been arrested in connection with the killing.
Two other sons of the 45-year-old man, who are juveniles, have been apprehended.
The boys made indecent gestures and passed lewd comments on the businessman's 27-year-old daughter when they were returning home from a hospital, police had said.