Vijayan said the government gave priority to the probe and ensured that the maximum punishment was given to the man.
"It was because of that, the first Cabinet meeting of the LDF government took a decision to set up a special investigation team (SIT) to probe the case," he said.
The SIT was given clear instructions to work impartially, without being influenced, he said in a statement.
The court drew a parallel with the 2012 Nirbhaya case in Delhi, where a 23-year-old paramedic student was brutally assaulted in a moving bus by five men and a juvenile.
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The Kerala law student was murdered on April 28, last year before the May 2016 assembly elections in the state.
The court held that the brutal acts of the convict, Muhammed Ameerul Islam, definitely fit this case within the umbrella of "rarest of rare cases on par with the Nirbhaya case in Delhi".
Vijayan said the SIT rose to the expectations of the LDF government and it was due to that the probe, which was groping in the dark during the previous UDF rule, succeeded.
The message was clear that the government would not allow anybody to escape after committing crime, he said.
The incident had turned into a political weapon, with the LDF, then in opposition, accused the UDF government of failing to ensure the safety of women. It also triggered statewide outrage and protests.
The LDF had then unleashed a campaign that the UDF had sabotaged the case, he pointed out.
"All that has been proved wrong with the court verdict," he said.
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