Police on Monday arrested Md Dulal, a security guard of Dihan’s house in connection with the murder of an O-level student of Mastermind School after rape in capital's Kalabagan area, according to police.
Dhaka Metropolitan Police, Deputy Commissioner (DC) of Ramna division Sajjadur Rahman confirmed the matter to media.
The security guard was taken into the custody of Kalabagan police station for questioning about the incident, he added.
Earlier, a teenage girl has been killed after rape in the capital on Thursday at noon. She was an 'O' level student.
Deputy Commissioner (DC) Sajjadur Rahman said to media that Mastermind School's 'O' level student Anushka Noor Amin and Iftekhar Fardin Dihan got involved in physical relation on the basis of 'mutual consensus' at Kalabagan in the capital.
Later, Anushka had profuse bleeding. Dihan rushed her to Anwer Khan Modern Hospital where the doctor concerned pronounced her dead before admission, he added.
Sajjadur Rahman, deputy commissioner (DC) of Ramna Zone of police, said this while talking to reporters at the Crime Association of Bangladesh (CRAB) office at Segunbagicha in the city on Friday.
He said that Iftekhar Fardin Dihan got involved in physical relations on the basis of 'mutual consensus' calling Anushka to his Kalabagan's Dolphin Golli's flat.
But, Dihan got scared witnessing profuse bleeding of Anushka and took her to Anwer Khan Modern Hospital by his private car where a doctor concerned declared her dead, he added.
On the other hand, Doctors performing the autopsy of the 17-year-old O Level student, who was brought to a hospital having already expired on Thursday, found evidence of rape on the victim's body.
After completing the autopsy on Friday afternoon, Dr. Sohail Mahmud, head of the forensic department at Dhaka Medical College, said she died due to excessive bleeding.
Samples were also collected for DNA profiling, as well as to determine whether any anesthetic drug was administered to the victim before death.