It was learnt that Sunil Kumar, a resident of Uttar Pradesh, who was living with the woman was missing for the past few days.
The ADCP said, "While working on the case, we caught hold of a relative of Sunil. On the basis of information, Sunil was nabbed from Ludhiana railway station. During questioning, Sunil said he was married and had come to Punjab with a woman, Bimla, of his village few months ago."
Bimla who was pregnant was pressuring Sunil to take her back to village and marry her, police said, adding that Sunil strangled her and fled away.