The deceased was identified as Mohammad Gilani, who lived with his family in Mangolpuri area, they said.
"Gilani, who worked as labourer, was allegedly murdered at a park in Sultanpuri area this morning as a morning walker noticed him lying in a pool of blood," said a police officer.
He also said his body bore two deep stab wounds, and added that they were waiting for the autopsy report and further investigation was on.