'LAW & ORDER' AND 'LAW & ORDER: SPECIAL VICTIMS UNIT' JOIN UP AS COPS SUSPECT DAUGHTER OF WEALTHY FAMILY IN MURDER; EMMY, TONY WINNER JANE ALEXANDER GUEST-STARS -- In the second part of a crossover episode featuring the casts of "Law & Order" and "Law & Order: Special Victims Unit," the police probe the gunshot murders of two men but their prime suspect -- a serial killer who previously eluded Detective Briscoe (Jerry Orbach) years before -- confesses to only one of the slayings. The cops re-focus their investigation of the wayward socialite daughter (guest star Noelle Beck) of a wealthy, politically connected -- and threatening -- grande dame (Emmy and Tony Award winner Jane Alexander), but the missing link to D.A. McCoy's (Sam Waterston) case may lie in finding a mob hitman (Steve Mones) who appears to be linked to both murders.