An ex-teacher from a top secondary school is being investigated for allegedly having sex with an underage student, who is now 16. Apparently, she started sleeping with the boy, when he was a member of one of the school's sports teams.

According to a report in The Straits Times, the former teacher who is in her 20s was the teacher in charge of the team at that point in time, and is alleged to have had sex with the boy on multiple occasions. A spokesman for the Singapore Police Force confirmed yesterday (July 25) that a report was filed and investigations are going on.

The issue was brought to light after the student's parents lodged a complaint with the school. The student cannot be named as he is a minor. The identity of the former teacher is also being withheld to protect the student's identity.

The former humanities teacher had abruptly left the school in March, and was seen crying in school a day before she left. People who knew her described her as a patient, knowledgeable and outgoing person.

It is not clear how long she had been a teacher at the school, but she was reported to have been involved with the sports team for about four years.

Recently, a professor from the NUS Faculty of Law was implicated in an ongoing probe by CPIB for allegedly having a sex-for-grades deal with a 23-year-old female student.

In 2009, a teacher became the first woman to be jailed for having sex with an underage boy. The 15-year-old was a student in the school where she was teaching. The 32-year-old mother of two had six trysts with the boy in holiday chalets and in her flat.

She pleaded guilty and was sentenced to 10 months' jail. Her conviction came after the Penal Code was amended in 2008 to make sex between an adult woman and a boy below 16 a crime.