Police said they have identified one Satheesh Babu from Kasargod, a habitual drunkard, as the assassin of 69-year-old sister Amala in her Lisieux Carmel Convent.
A lookout notice has been issued for him. His photographs were also released by police.
They said Cyber Cell's help was sought and it was found from the mobile signals that Satheesh Babu was in Pala in the initial hours after the incident.
Police said he visited a friend who was admitted in a hospital in the neighbourhood of the Convent before committing the crime.
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Police suspect that Satheesh Babu is a serial offender targeting convents.
They cited a recent complaint filed by another convent in Bharananganam near Pala, which said two mobile phones were stolen from there and that after detailed investigation it was found that the phones were used by Babu on various occasions.
His friends who were questioned by police revealed the way in which he operates, they said.
Sister Amala was found dead in a pool of blood in her convent room on September 17.
Suspecting that it is a case of "unnatural death" police had immediately constituted a team of officials headed by Pala Deputy Superintendent of Police Suneesh Babu to probe the case.