Andy Sipowicz' (Dennis Franz) joy over the birth of baby Theo is shattered when Andy Jr. (Michael DeLuise) is killed in a shoot-out. The grieving Sipowicz asks Bobby Simone (Jimmy Smits) to personally track down the killer. Bobby agrees, only to incur the wrath of Diane (Kim Delaney) -- and to come up depressingly empty-handed at every turn. And the 15th Precinct loses one of its stalwarts when she accepts a high-paying job with a California computer firm. This episode marked the final appearance of Gail O'Grady as Donna Abandando. ~ Hal Erickson, Rovi