Abdul Nadeem, the husband of well-known cross-country biker Sana Iqbal, who died in a car crash last month, was arrested by the Hyderabad police on Friday.
However, he obtained bail after it was granted by a court.
This comes after allegations by Sana's family that it was a "pre-planned" and "cold-blooded murder", and not an accident.
The 30-year-old, who undertook a solo ride through the country to create awareness about suicides and depression, died when the car which her husband was driving rammed into an electric pole on a road divider in Narsingi in Hyderabad, on October 24.
Nadeem, a techie, escaped with injuries while Sana died on the spot as the left side of the vehicle bore the brunt of the impact.
He was arrested on Friday, after he was booked under Section 304 (A) (culpable homicide not amounting to murder) of the Indian Penal Code (IPC).
Sana's mother, Shaheen Khan, said that Nadeem and his mother had been harassing Sana for money since the marriage three years ago.
"She lived with her husband only for three to four months as they were harassing her. We had also lodged complaints with the police but they did nothing beyond counselling," Shaheen said.
"He wanted her to transfer her salary to his bank account. He was also forcing her to allow him to use her credit cards for drawing Rs 5 lakh," she claimed, pointing out that nobody from Nadeem's family attended the last rites.
Shaheen alleged that Nadeem used to visit the house and force Sana to accompany him by creating a scene.
When she returned from duty at 1:30 am on October 24, Nadeem who was waiting near the house asked her to join him for a drive.
Shaheen claimed that Sana initially refused but when he allegedly threatened to create a scene, she accompanied him, leaving their son with her sister. "He might have made an assessment of Narsangi area to execute his plan as nobody would be there and it will be dark," she said.
The eldest of Shaheen's four daughter, Sana was working as a manager with Hinduja Global Services. She did MA in Philosophy and earlier worked with Google and Genpact.
She had embarked on a solo 38,000-km journey across India in 2015 on her Royal Enfield Bullet Electra to create awareness against suicide and depression.
As part of her anti-suicide mission, she had delivered talk at seminars in different parts of the country.