Perpetrator

The perpetrator could almost completely remove all traces.

The perpetrator was Canadian.

Someone who sees something wrong being done and does nothing about it, is as culpable as the perpetrator of the act.

The perpetrator was obviously insane.

Sami was the perpetrator of the murder.

Sami was the perpetrator.

The perpetrator was arrested by an off-duty police officer.

I looked with interest upon this man, who was accused of being the perpetrator of a crime of violence.

The perpetrator used a sledgehammer to smash his way through reinforced glass doors.

Tom was framed to be the perpetrator of Mary's murder.