Why did 'Milan' Actually Show up in end of movie Kahaani[2012]?

Question

In the recently released Bollywood movie Kahaani, at the ending, why did "Milan" actually show up? Why did he want to Kill Vidhya Balan? How was he seriously affected by the things done by her? Why didn't he send just someone else instead of traveling all the way from wherever he was to Kolkata [West Bengal, India] to kill her?

Answer 1

From wikipedia-

Vidya calls Bhaskaran to tell him that she has got hold of sensitive documents from Sridhar's office and if Bhaskaran helps Vidya find her husband, she would hand over the documents to Bhaskaran. Bhaskaran nonchalantly tells Vidya to contact the local police as he is not associated with this. However, within a few minutes, Vidya gets a call from an unknown number, warning her that she should hand over the documents to the caller if she wishes to see her husband alive. Khan, recognizing the voice, reveals the caller to be Milan Damji.

As per this conversation Bhaskaran got threatened so he sanded the Millan to meet Vidya because she asked to meet her husband who looks like Millan. So Bhaskaran's plan is to kill Vidya by his own husband(i mean millan who looks like his husband). So its order from Bhaskaran his head, so that millan personal gone to meet her.