Is there any rule to punish a lawyer who is trying to cover facts and mislead the court?

I am not sure of this.

Today Mr. Ram Jeth Malani has said that It was not Manu Sharma who killed Jessica Lal but rather some "Sikh gentleman".

I firmly beleive that any individual should have the right for a fair trail. It is quite possible that what Mr. Ram Jeth Malani is telling is true.

But if it is not true and is an attempt by him to mislead the court, then he should be severly punished, barred from the Law Association and publicly humiliated because what is is showing is severe disregard for the law of this country by manipulating the system.