The accused, identified as Chiku Munda, was later taken to the Market Nagar police station for interrogation.
The accused has confessed that he had helped the accused in secretly burning the dead body of the teacher in a crematorium last month, police said.
“We are going to arrest the other accused involved in the case on the basis of the information provided by Munda”,” said a senior police officer.
Police had earlier arrested five persons, including the prime accused Paresh Mohapatra, principal of St Xavier School near Barabati Stadium. All of them were later sent to Choudwar Circle Jail.
On the basis of interrogation of the five accused, police raided a hideout inside the SCB Medical College and Hospital and arrested Munda.