Eventually, when he wishes to start life again on a fresh slate because he now wants to live, in an O Henry-sque moment, he's denied a pardon and on Sept 29th, 1991, two years after he is originally convicted of the multiple murders, he is hanged to death.
In a series of flashbacks, the story unfolds focusing on Sathyan's past and recreates the chilling crime scene, explaining his actions.
Sathyan is a fatherless child who is bullied and abused in his childhood by the people around him until he is rescued by a priest who realizes that the kid is a talented artist.
Sathyan likes Jaya and wishes to marry her and settle down in life but destiny has other ideas; circumstances force her to end up as a prostitute and there are signs that her sisters will sink in the same quagmire later.
In a moment of extreme paranoia, Sathyan kills the two girls in a bid to save them from prostitution and eventually both the guys responsible for her state.