Middletown, Ohio-The death of a Middletown maintenance worker, presumably from nitrogen leaks in gas lines, remains under investigation by officials with the city and the two companies involved. The tests by Middletown officials identified the source of the nitrogen leaks in lines running from Air Products & Chemicals to AK Steel’s Middletown works. Air Products spokesman Art George said the 250-foot lines are being excavated to find the leaks. Middleton firefighters tried to rescue the worker, identified as Jabin Lakes, who was doing a routine inspection of a sewer line when he died May 7. The Middleton Fire Department declined to answer questions, referring calls to City Attorney Les Landen, who did not respond to email inquiries. There also was no response from AK Steel at Middleton. Details on the kind of nitrogen involved were not available.