investigation

As the investigation progressed, it became clear that the skull had been smashed by some heavy blow.

It seems he was struck with some heavy weapon — his skull was shattered.

She tried to dig into the truth behind the rumor.

She determined that the novel was based on a true story.

She hired a private detective to investigate the case.

She seems to have some connection to the case.

She seems to be involved in the murder case.

The actions of Watch Officer Cohen, who was personally directing navigation at the time of the accident, become the biggest point.

A fact-finding investigation committee was set up to look into the cause of the incident.

Needless to say, the search ended in failure.

She painstakingly examined the company's performance.