The accused, identified as Navin Kumar (30), a manager in the Rohini Branch of HDFC Life Insurance company, called the victim on March 2 to resolve some issues and murdered her.
The 28-year-old woman, a business development executive in the same branch, used to live her parents in Rohini area.
According to police, two persons, who were driving past Kanjhawla Road in the wee hours of March 3, saw the accused allegedly dragging a woman out of his car and then hitting her head on the pavement. They dialled 100 but by the time police could reach, he fled the scene with the victim.
The hospital authorities told police that the woman was alive and the man who brought her to the hospital had disappeared, claiming that she met with an accident.
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Subsequently, the victim was referred to another hospital.
The police then registered a case of attempt to murder and formed a team to nab the accused. Around two days later, the woman succumbed to injuries in the hospital.
Based on local and technical inputs, the police zeroed in on Navin Kumar and arrested him from Mongolpuri area on Monday under charge of murder, DCP (Outer) Vikramjit Singh said.
When the victim came to know of his marriage, Kumar, a native of Haryana, started pursuing the woman not to disclose their relationship to his wife.
On March 2, he called her near a metro station in Rohini to resolve the issues.
When he failed to convince her, he first allegedly tried to strangulate her and then hit her head on the pavement, police added.
Kumar was hiding in the national capital, police said, adding a case was registered under IPC 302 (murder), they said.