The state government has constituted three member SIT to investigate the murder of Kaur, official sources said today.
"SIT will be headed by Shashi Prabha Dwivedi, IG-Crime. The other two members of the team are DIG, Roopnagar RK Jaiswal and SP crime Balbir Singh," Inspector General of Patiala Zone Paramjeet Singh Gill told PTI.
Meanwhile, postmortem report said that Parampreet Kaur was strangulated with a fine rope and may have been even poisoned to ensure death.
Mayor Pardhan, along with his accomplice Paramjit Kaur and her son Harpreet Singh was booked under murder charges on Saturday after Parampreet was found hanging at her in-laws' house in Kashmira Thobha area of the walled city.
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Police have already arrested Harpreet, the husband of the deceased, and his mother Paramjit.
Meanwhile, Punjab's Deputy Chief Minister Sukhbir Singh Badal, has asked Jaspal Singh Pardhan to resign from the post of Mayor.
"The SAD president has examined all aspects related to the case and asked Pardhan to resign," party spokesman Daljeet Singh Cheema told PTI.