His supporters claim that he knew the culprit, but he didn't break the seal of confession.
Benedict Onamkulam had killed Mariyakutty at the stream of Madatharuvi, near Ranni with the motive of ending their affair.
Onamkulam was sentenced to death by the session court, however, the High court of Kerala acquitted and freed him purely based on technical grounds dismissing circumstantial evidence in 1967.
The case has been so sensational in Kerala that it inspired a number films.
[1] It came into prominence in local media again in 2010 when the Changanassery Bishop opened Fr.