According to police, the gardener lives in Sultanpur area in the vicinity of the woman's house and was a friend of her.
"The accused has been identified as Ramtej (30), a resident of Sultanpur in Uttar Pradesh. He worked at Kusum nursery in Vasant Kunj and lived on its premises. Personal belongings of the victim including a mobile phone have been recovered," said Deputy Commissioner of Police (South) Prem Nath.
"Her proximity with some other men had irked him following which he along with some of his associates decided to teach her a lesson. They had sexually assaulted her and a wooden stick was also inserted in her private parts before killing her. The body was dumped in the nursery. Ramtej has been arrested and efforts are on to nab his associates," said a police officer.
The incident came to light on Saturday around 8:20 AM here when a security guard informed the police about the body which he had spotted lying in bushes.
The semi-naked body of the woman with hands and legs tied was found in the bushes of the nursery. Yesterday, scores of students from Jawaharlal Nehru University had staged a protest outside Vasant Kunj police station in south Delhi over alleged police inaction in the case.