An Indian fisherman, lodged in a jail in Pakistan's southern city of Karachi after his arrest in 2006, has died of 'cardiac arrest', prison authorities said on Thursday.

The fisherman, who died in Karachi's Landi jail, was identified as Laksman Kanji, Dawn News channel reported quoting the prison officials.

The jail's medical officer claimed that the fisherman  -- arrested on February 10, 2006 for allegedly fishing in Pakistani waters -- died of cardiac arrest, the channel reported. No other details were immediately available.