NYPD Blue: Season 09

At the end of NYPD Blue's eighth season, Danny Sorenson (Rick Schroder), the troubled young partner of the 15th precinct's Detective Andy Sipowicz (Dennis Franz), had disappeared under sinister circumstances after a botched undercover operation. It was not until season nine got under way that Danny's murder was confirmed, sending Sipowicz -- not to mention the rest of the 15th -- into an emotional spiral. In the fine revolving-door tradition of NYPD Blue, Danny was immediately replaced by another