Many who live near the SUKE highway construction site say they were opposed to the project from the start.
The Department of Occupational Safety and Health says further legal action will be taken based on the results of the probe.
So many incidents happening in such a short period of time should be a sign to the authorities that something is not right.
The body of the Chinese national has been sent to Hospital Canselor Tuanku Muhriz in Kuala Lumpur for post-mortem.
More than 30 hours has passed since the incident in which a launcher crane collapsed, killing three and injuring another.