TV Homicide: Life on the Street - Season 7 Episode 21 : The Why Chromosome Homicide: Life on the Street - Season 7 Episode 21 : The Why Chromosome 8.081/10 by 135 users When the men are nowhere to be found, Sheppard and Ballard team up to investigate the death of young girl, who's a teenage gang member. With the wedding one week away, Billie Lou asks for Munch's help with her neighbor's abusive boyfriend. After Munch approaches him strongly, the boyfriend retaliates by coming to the Waterfront and slamming Billie Lou's head on the bar. Munch claims he came on strong with the guy, because his ""testosterone riddled behavior"" was due to the celibacy Billie Lou imposed on him, to make their wedding night more special. Billie Lou wants to delay the wedding until the welt on her forehead goes away in about 3 weeks. After Sheppard and Ballard solve their case, Sheppard reminds Lewis that his problem with her is not going to keep her from doing her job. Details Casts Posters Images Title Homicide: Life on the Street - Season 7 Episode 21 : The Why Chromosome Alternative Titles Убойный отдел: Жизнь на улице First Air Date 1993-01-31 Last Air Date 1999-05-21 Number of Episodes 122 Number of Seasons 7 Genres Mystery, Drama, Crime, Networks NBC, Casts Richard Belzer, Giancarlo Esposito, Peter Gerety, Clark Johnson, Yaphet Kotto, Michael Michele, Kyle Secor, Jon Seda, Callie Thorne, Toni Lewis Plot Keywords , John Munch Richard Belzer Michael Giardello Giancarlo Esposito Stuart Gharty Peter Gerety Meldrick Lewis Clark Johnson Al Giardello Yaphet Kotto Rene Sheppard Michael Michele Tim Bayliss Kyle Secor Paul Falsone Jon Seda Laura Ballard Callie Thorne Terri Stivers Toni Lewis Episodes List Homicide: Life on the Street Season 7 :Episode 1 La Famiglia La Famiglia 1998-09-25 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 2 Brotherly Love Brotherly Love 1998-10-16 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 3 Just an Old Fashioned Love Song Just an Old Fashioned Love Song 1998-10-23 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 4 The Twenty Percent Solution The Twenty Percent Solution 1998-10-30 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 5 Red, Red Wine Red, Red Wine 1998-11-06 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 6 Wanted Dead or Alive (1) Wanted Dead or Alive (1) 1998-11-13 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 7 Wanted Dead or Alive (2) Wanted Dead or Alive (2) 1998-11-20 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 8 Kellerman, P.I. (1) Kellerman, P.I. (1) 1998-12-04 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 9 Kellerman, P.I. (2) Kellerman, P.I. (2) 1998-12-11 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 10 Shades of Gray Shades of Gray 1999-01-08 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 11 Bones of Contention Bones of Contention 1999-01-15 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 12 The Same Coin The Same Coin 1999-01-29 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 13 Homicide.com Homicide.com 1999-02-05 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 14 A Case of Do or Die A Case of Do or Die 1999-02-12 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 15 Sideshow (II) Sideshow (II) 1999-02-19 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 16 Truth Will Out Truth Will Out 1999-03-26 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 17 Zen and the Art of Murder Zen and the Art of Murder 1999-04-02 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 18 Self Defense Self Defense 1999-04-09 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 19 Identity Crisis Identity Crisis 1999-04-30 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 20 Lines of Fire Lines of Fire 1999-05-07 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 21 The Why Chromosome The Why Chromosome 1999-05-14 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. Homicide: Life on the Street Season 7 :Episode 22 Forgive Us Our Trespasses Forgive Us Our Trespasses 1999-05-21 An American police procedural chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit.