Lt Col Santosh M Badhkharke, posted with 65 Field Regiment here, underwent a polygraph test on March 18, Inspector S S Randhawa, who is probing the case, said today.
Badhkharke's wife, Vanita, was found dead under mysterious circumstances in their residence in the cantonment area on March 14, 2012, he said.
Randhawa had accompanied Badhkharke to the Central Forensic Science Laboratory, New Delhi, where the lie-detector test was conducted.
He said DCP Kaustub Sharma had recommended the polygraph test after Vanita's parents approached police suspecting the army official's role in her murder.