Aarushi was found murdered in her flat in Jal Vayu Vihar in Noida on May 16, 2008.

A day later, their domestic servant Hemraj's body was found on the terrace.

The two were killed on the intervening night of May 15-16, says CBI.

The investigation went through various twists and turns, with Noida police first taking it up, and then the matter was handed over to CBI.

The finger of suspicion fell on some servants, who had to undergo narco test, but later CBI changed its stance and arraigned the dentist couple as the killers.