The arrestee was identified as Abul Hossain, a local industrialist and owner of Shimla Hospital and Diagnostic Centre.
Subarna Akhter Nodi, 32, district correspondent of private channel Ananda TV, and editor of Daily Jagroto Bangla, an online news portal, was hacked to death on Tuesday.
Abul Hossain was arrested from Shimla Hospital after Nodi’s mother filed a case with Sadar Police Station against 6-7 people, including Abul Hossain and his son Razib, over the killing, said additional police superintendent Goutam Kumar Biswas.
Victim’s relatives said Nodi got married with Razib Hossain, son of Abul Hossain, one and half years back without the consent of Razib’s family.
When Razib divorced Nodi, she filed a dowry case against Razib which is still under trial.
On Tuesday night, Nodi was hacked to death by a group of men in front of her house on her return from her workplace in the district town.
Locals took her to General Hospital where doctors declared her dead.
Meanwhile, local journalist formed a human-chain at Pabna Press Club demanding justice for their fellow.
Chattogram Journalists Union condemned the killing and demanded immediate arrest of her killers.