The victim has been identified as Mehboob Ali, a resident of Harewali village in Bawana, they said.
Police said Ali had gone to Bhopal in Madhya Pradesh for a Tablighi Jamaat conference and returned to the national capital in a truck of vegetables after 45 days.
He was held at the Azadpur vegetable market and released after a medical examination.
Police said when he reached his village, rumours spread that Ali had a plan to spread coronavirus.
He was thrashed in the fields on Sunday. He was rushed to a hospital by police where he died, a senior police officer said.
Police registered a case under relevant sections of the IPC and arrested three persons, they added. NIT RDK