Earlier, however, AITUC General Secretary Gurudas Dasgupta said the victim was allegedly stabbed to death by some miscreants.
A number of roadways employees and members of various employees' unions gathered at the civil hospital at Ambala city where the body of Singh was kept for postmortem.
The state president of Haryana Roadways workers union Sarbat Poonia, who also reached the civil hospital, said after consulting with union leaders, office bearers of the union would finalise a strategy in this regard.
The senior officers of the administration are in touch with union leaders to diffuse the matter, sources said.