A constable attached with the marine unit of the city police died on Monday morning after he fell off a speed boat during patrolling near the cargo vessel MSC Chitra, which had collided with another vessel. The victim, Ramesh Tukaram More, 45, and three other constables were patrolling in a speed boat in the wee hours of Monday at approximately 1.5 nautical miles from the Chitra.More's body was recovered by life guards later and sent to the state run J J Hospital.