According to police, the woman was a widow and having an "affair" with the accused for the last three years.
The incident occurred on May 8 here when he allegedly poured kerosene on the women and set her on fire, a day after confronting her about a man who claimed to be her "beau".
She was immediately rushed to a local hospital from where the doctors referred her to Safdarjung Hospital in Delhi for treatment.
On May 11, she succumbed to her burn injuries in the hospital.
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"The Crime Branch, in its investigation, found that the incident took place after the accused received a call in which an unknown person claimed to be the woman's lover.
"When she declined knowing any such person, he burned her alive in a fit of rage," Dubey said.
The accused was on the run before he was nabbed, he added.
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