The deceased was identified as Wasimul Haq, 55.
Ramna police sub-inspector Mizanur Rahman said the man was found unconscious around 6:00 PM and was taken to the emergency department of Dhaka Medical College Hospital, where doctors declared him dead.
Eyewitnesses reported that he had come to the park in the morning and was seen washing his hands and face while leaving his shoes on. A short while later, although his shoes remained, he disappeared and was later seen floating in the lake.
Police identified him through fingerprint records.
Wasimul Haq was the son of a former secretary and lived in New Eskaton Garden with his mother. He had been suffering from illness and mental instability for about 30 years and had no spouse or children. His body has been sent to the Dhaka Medical College morgue for post-mortem, reports UNB.