Ameerul had trespassed into the house of the 30-year-old law student on April 28, 2016, in Perumbavoor and raped and murdered her by stabbing her at least 30 times, disembowelling her and mutilating her genitals.
Assamese native Ameerul Islam is the lone accused in the case in which the prosecution relied on circumstantial and material evidence in the absence of direct ones.
Chennai: The death sentence awarded to Ameerul Islam in the Jisha murder case is a judicial recognition for government's uncompromising stand on issues concerning women's security, chief minister Pinarayi Vijayan said.
The court said the victim was abandoned by her father when she was a child.
However, the court rejected the defense counsel's plea and asked him to plead only on the quantum of punishment.
The court said that the substantive sentence of imprisonment ordered shall run concurrently.
Reacting emotionally to the sentence, Jisha's mother, Rajeshwari, told media persons, "No other mother in this world should go through this".
The accused, however, was not found guilty under 201 (causing disappearance of evidence of offence) and various sections under SC/ST (prevention of atrocities) amendment Act 2015.
The court also awarded 10 years rigorous imprisonment and a fine of ₹25,000 under section 376 of the IPC.
The woman, who hailed from a poor family, was brutally assaulted using sharp-edged weapons before being murdered at her house. The trial commenced in April this year.
He then fled to Assam on a train the next day and after laying low for sometime returned to Tamil Nadu to look for a temporary job-from where he was finally arrested in June 2016.
The Special Investigation Team probing the case had used DNA technology and verification of call record details to prove Islam's involvement in the crime.
The LDF government, after assuming power on May 25 past year, changed the investigation team and entrusted the probe to ADGP B Sandhya in its first cabinet meeting itself.
More than 100 police personnel questioned over 1,500 people in the case.
Police have said a blood stained footwear found from a canal near the victim's house was one of the key evidence in identifying the culprit.