After stalking her for months, he allegedly murdered S Swathi using a sickle here last week.
Ram Kumar, an engineering graduate, was arrested in Tirunelveli. Kumar, a native of Shencottah near Tirunelveli, was staying in Choolaimedu area in the city where Swathi had resided for quite some time.
He was taken to a hospital for treatment after he allegedly attempted to commit suicide, police said.
The motive of the killing is being investigated and other probe-related details in the case are being awaited, police said.
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A report from Tirunelveli quoting a top official of the local Medical College Hospital, where Kumar is being treated, said he was out of danger.
Hospital Dean Sithi Athyia Munavara told reporters that Kumar was brought with a bleeding injury in his neck and in a semi conscious state around 1.40 AM.
An emergency medical team immediately treated him and carried out a 45-minute long procedure at the operation theatre during which 16 stitches were made.
The man was later shifted to a ward in "good condition" and doctors were giving treatment, she said.
It would take seven days for the wound to heal and it would be difficult for him to speak for the next two days.
On seeing the police personnel, the accused, who was sleeping in a shed in front of the house, ran inside and inflicted an injury in his throat region with a blade.
Police rushed him to the government hospital in Tenkasi and after first aid shifted him to the Tirunelveli Medical College Hospital.