my first and most suspect is : Amrit
becoz wen arjun was going in the room to kill KSA, she was standing with arohi and watching him go whereas arohi was also watching him go... i dont no its very hard to suspect her, but rudra and amrit might be hands-in-together in this crime...
first rudra ignited the fire in arjun and then he might have made a plan with amrit to kill ksa if arjun decided to back out...
but the one and only thing tht backfires this theory is tht when ksa got shot, along with others amrit also came from the stairs behind KSA... so either its not her at all, or she must have been very quick to join everybody else to come see KSA...
secondly i also think tht she has a hand in brainwashing Sudhir (arohi's dad) in to thinking tht they r protecting KSA in order to save him from jail... bcoz those 2 r the only ones who seem to knw the truth in the family...and if u remember tht previous episode where v found out those 2 know abt it she was the one saying tht wat v did is rite and v can continue to hide in order to save arjuhi relationship, whereas sudhir was feeling somewhat guilty for hiding it ...
so to some extent she might also have a hand in of killing arjuns mother...
what do u guys think?