Moinudding was arrested late last night.
Reshma (25), was found dead under mysterious circumstances at her in-laws' residence in Arya Nagar colony on November 10 last, SHO Loni Border R P Sharma said.
Deceased's brother had lodged an FIR against her husband and in-laws for allegedly torturing Reshma to death for not bringing the demanded dowry amount of 1 lakh rupees.
Rest of the absconding accused will be nabbed soon, police said.