Santosh Kumar Singh, son of former IPS oficer JP Singh, was Priyadarshini's senior in Delhi University. It was here that he was besotted by Mattoo, made indecent proposals to her and started stalking her.
It was on January 23, 1996 that Priyadarshini Mattoo was allegedly raped and killed by Santosh Kumar Singh.
Singh had appealed before the apex court against an October 2006 verdict of the Delhi High Court awarding death sentence to him. The SC bench had reserved its judgment on July 29.
Finally, on October 6, 2010, Supreme Court commuted Santosh Singh's death sentence to life in the Priyadarshini Mattoo rape-cum-murder case.