Which of the following actors did not play one of Dennis Franz's partners on the U.S. TV cop drama series "NYPD Blue"?

On the ABC TV series "NYPD Blue" (1993 - 2005), Dennis Franz had partners who were Detective John Kelly (David Caruso), Detective Bobby Simone (Jimmy Smits), and Detective Danny Sorenson (Rick Schroder). He never had a partner who was played by Rob Morrow.

In the 1st season and the 1st four episodes of the 2nd season of the series, John Kelly as portrayed by David Caruso was an Irish-American who had been promoted to the rank of detective at the relatively early age of 28. He was a brilliant and frequently smoldering cop, whose father had been a heroic cop that died in the line of duty.

In the 5th episode of the 2nd season and remaining until the 5th episode of the 6th season, Jimmy Smits as Bobby Simone was introduced to the NYPD squad. He became Dennis Franz's (Andy Sipowicz's) partner after his former partner, John Kelly, was forced to leave the NYPD. Simone's previous job had been as a driver for the NYC police commissioner, a role that initially riled Sipowicz.

Appearing from the 6th season (1998) through 8th season (2001), the character of Danny Sorenson was played by Ricky Schroder. Sorenson was a US Army Desert Storm veteran who was almost 27 years old. He was introduced in episode six of the 6th season as the replacement for the squad's deceased Bobby Simone.

With Rob Morrow during his TV career, he was noted for playing an officer of the law in the role of FBI agent Don Eppes. He was in almost 118 episodes of the TV show "Numb3rs" (2005 - 2010).