CHENNAI: A 19-year-old engineering student of Anna University in Chennai committed suicide on Tuesday. Police said she had difficulty coping with the academic pressure.Dhairiyalakshmi, a first year student of BE civil engineering, hanged herself in the hostel room in Kotturpuram, police said. This is the third suicide of engineering students in Chennai in less than three weeks. Kuldeep Yadav, a second year civil engineering student at IIT-M, was found hanging in his hostel room on April 9. On March 29, S Manivannan, a third year engineering student of Anna University had committed suicide on the campus.After initial inquiries into the death of Dhairiyalakshmi on Tuesday, police said she might have been under pressure after she scored low marks in an internal assessment.Dhairiyalakshmi, daughter of Sakthivel from Villupuram, a predominantly rural district 160km south of Chennai, had studied in Tamil medium before she joined engineering, where the medium of instruction is English. She had six arrears, police said.