UP Police on Monday arrested father-in-law of deceased Nikki Bhati, making it fourth arrest in Greater Noida dowry murder case. Nikki was set on fire at her in-laws' house, after which her husband, brother-in-law, and mother-in-law were arrested. Nikki's family alleged that in-laws demanded ₹36 lakh dowry and also tortured her and her sister, who was married into same family.