The Congress on Monday described the killing of Indian National Lok Dal`s (INLD) Haryana unit president Nafe Singh Rathee as the state`s "first political murder" and demanded a probe into the incident either by a high court judge or a high court judge-monitored CBI investigation.

Senior Congress leader Raghuvir Singh Kadian said Rathee`s death was not natural. "It is a political murder and the first such incident in Haryana after it was carved out as a separate state (in 1966)," Kadian said in the Assembly.