Catherine laid a conviction based on little evidence and has to suffer the consequence. After a Sci-Fi induced episode on April 16, "CSI: Crime Scene Investigation" will revisit an old case when Catherine had her first few investigations.
A man, convicted felon in the murder, claims that the verdict was based on faulty forensic evidence. Catherine was solo in the case that happened back in 1991. She then has to re-examine the evidence, which only includes a print on the rock, with the assistance from Dr. Raymond Langston.
The episode called "If I Had a Hammer" airs April 23. "E.T.: The Extra-Terrestrial" star Henry Thomas, meanwhile, guest stars as the convicted felon, Jeremy Kent. His character reportedly learns everything about forensics after spending 20 years in prison and demands a trace back to his case.