[s3e21] The Dead Pool File

A rival swimmer who used undetected steroids supplied by the coach.

A former Olympic champion and Zack's mentor. It is revealed Rob was a long-term steroid user; he killed Zack to prevent his secret from being exposed. [S3E21] The Dead Pool

Zack was drugged with powdered chlorine and drowned in the UNY training pool. Key Suspects & Motives: A rival swimmer who used undetected steroids supplied