![[S3E21] The Dead Pool](data:image/svg+xml;nitro-empty-id=ODUwOjE5Nw==-1;base64,PHN2ZyB2aWV3Qm94PSIwIDAgMTkwIDcwIiB3aWR0aD0iMTkwIiBoZWlnaHQ9IjcwIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==)
[s3e21] The Dead Pool Apr 2026
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.
Castle seeks counsel from real-world authors Michael Connelly and Dennis Lehane during their recurring poker game, though they are notably aloof toward his new protégé. Episode Details Original Air Date: April 11, 2011. [S3E21] The Dead Pool
Zack was drugged with powdered chlorine and drowned in the UNY training pool. Key Suspects & Motives: A former Olympic champion and Zack's mentor
Castle brings along Alex Conrad , a rookie mystery novelist he is mentoring. Much to Castle's jealousy, Beckett takes a liking to Alex, even allowing him to shadow the investigation. Episode Details Original Air Date: April 11, 2011
Zack's best friend; the two had been stealing cars together to help Zack afford basic necessities while training. Subplots & Themes
Zack Lindsey, a self-made champion swimmer on a partial scholarship.
A rival swimmer who used undetected steroids supplied by the coach.