A 62-year-old man arrested on suspicion of perverting the course of justice following the disappearance of a Newbridge man has been released on bail.
Officers are continuing to question a 27-year-old on suspicion of murder.
24-year-old Kyle Vaughan was last seen at the end of December.
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The man and woman who were found dead this morning on a Cardiff street were stabbed. Warning: Graphic content.