Deputy Commissioner of Police (west) Vijay Kumar said the accused, Kuldeep Thakur, was arrested from his hideout in west Delhi today.
Thakur, who is a small-time property dealer, has over 20 cases of murder, extortion and attempt to murder pending against him.
"Thakur told police that she was cheating on him and was having relationship with some other men as well. He claims he killed her following an argument over the issue," the officer added.
There were multiple injuries on the body and it was suspected that the woman, who used to run a coaching centre for students preparing for competitive exams, had been smothered to death.
Also Read
During investigation, it was found that her live-in partner - Thakur - was missing since the incident.
Police tracked down the location of the accused through electronic surveillance and analysis of his call detail records.
Several raids were conducted across Delhi before police could nab him.
The couple also had a secret wedding at a temple, however, they were not legally married, sources said.
Disclaimer: No Business Standard Journalist was involved in creation of this content