On Jan. 23, the newest episode of the procedural will feature Maura Tierney ... the-scenes look at the reunion. Tierney joined the cast of ER in 2000 as nurse Abby Lockhart while La Salle ...

Maura Tierney is ... Following ER was Rescue Me. “They called me up and offered me this arc for this character that was completely different from Nurse Abby, manager for rock and roll bands.

Both Maura Tierney and Mekhi Phifer look a lot happier BTS than they did as their characters in "Greater Good" on January 23! Of course, Phifer's character didn't really have anything to smile ...

Both Maura Tierney and Mekhi Phifer look a lot happier ... he included one that not only featured Mekhi Phifer and Michael Beach as former ER stars, but also Mehcad Brooks as a current Law ...

Maura Tierney as Lieutenant Jessica Brady, Mekhi Phifer as Lyman Ross in "Greater Good" ...

Will Hart/NBC Mekhi Phifer, Maura Tierney and Eriq La Salle on set of "Greater Good" Tierney joined the cast of ER in 2000 as nurse Abby Lockhart while La Salle portrayed Dr. Peter Benton. Phifer ...