| 1 | Drew | Witthuhn | David's younger brother. |
| | David | | Manuela's husband. |
| | Manuela | | Only child of a German immigrant. |
| | Ruth | | Manuela's mother. |
| | Ron | Sharpe | Ruth's friend. |
| | Max | Whitthuhn | Drew's father. |
| | Ron | Veach | A lead detective. |
| | Paul | Jessup | An investigator. |
| | Horst | Rohrbeck | Manuela's father. |
| | Possum | | A military trained dog. |
| | Jim | White | A criminalist of Orange County Sheriff's department. |
| 2 | Roger | Harrington | Keith's father. |
| | Patty | | A registered nurse. Keith's wife. |
| | Keith | | A medical student. |
| | Merideth | | Patty's friend. |
| | Jay | | Patty's friend. |
| | Sue | | Patty's sister. |
| | Daryll | Coder | An investigator. |
| 3 | Patton | Oswalt | Michelle McNamara's husband. |
| | Pete | King | A long-time reporter for LA Times. |
| | Alice | | Michelle's daughter. |
| 4 | Terry | Keating | A drum teacher. |
| | Cameron | | Michelle's friend. |
| | Leo | | Michelle's father. Aka: Brother Leo. |
| | Malachy | Dooley | A reverend. Brother Leo's friend. |
| | Margo | | Michelle's older sister. |
| | Mary Rita | | Michelle's sister. |
| | Kathleen | | Michelle's sister. aka: Beanie. |
| | Anton | | Kathleen's crush. |
| | Lisa | Van | Michelle's friend. |
| | Kris | | Lisa's sister. |
| | Maureen | | Michelle's sister. |
| | Marilyn | | A theology professor. Michelle's aunt. |
| | Bob | | Michelle's brother. |
| | | Ray | Michelle's first-grade teacher. |
| | Danny | Olis | Michelle's first-grade classmate. |
| | Kathleen | Lombardo | A rape and murder victim in Oak Park. |
| | Ron | Tammen | A wrestler and bassist. |
| | Tom | Olis | Danny Olis's younger brother. |
| | Mike | | Danny's grade-school friend. |
| | Darren | | Mike's friend. |
| | Tom | McBride | A guy who lived a few doors down from the murder scene. |
| 5 | Sheila | | A rape victim. |
| | Roy | Hazelwood | A former FBI profiler. |
| | Richard | Shelby | A detective of Sacramento County Sheriff's Department. |
| | Jane | Carson | A rape victim. |
| | Jack | | Jane's husband. |
| | Carol | Daley | A detective of Sacramento County Sheriff's Department. |
| | Douglas | Moore | Was shot dead by man who had been prowling in backyard. |
| | Priscilla | | Douglas's sister. |
| | Mavis | Moore | Douglas's mother. |
| | Dale | | Douglas's father. |
| | Fiona | Williams | A rape victim. |
| | Justin | | Fiona's son. |
| | Phillip | | Fiona's husband. |
| | Ray | Root | A lieutenant. Shelby's boss. |
| 6 | Claude | Snelling | A journalism professor. |
| | Bill | McGowen | A Visalla police detective. |
| | John | Vaughan | A detective of Visalla Police Department. |
| | Richard | Sandstrom | A director of Los Angeles PD's hypnosis unit. |
| | | Hanley | Donna's mother. |
| | Donna | | A girl who had encountered a ski-mask intruder in backyard. |
| | Glenda | | A girl who was shut while pulling her window curtain. |
| | Carl | | Glenda's boyfriend. |
| | Fran | Cleary | One who had a strange encounter with the man in backyard. |
| | Shari | | Fran's daughter. |
| | Ken | Clark | A detective. |
| | Paul | Holes | A criminalist of Contra Costa County Sheriff's Office. |
| 7 | Luton | | A boy who brought a dead cat to his home. |
| | Alec Jeffrey | | A geneticist. |
| | Gerald | Parker | A prison inmate. |
| | Mary | Hong | A criminalist of Orange County Crime Laboratory. |
| | Song | Si | A Chinese coroner and detective. |
| | Janelle | Cruz | A rape victim. |
| 8 | Linda | Sheen | A realtor. |
| | Norm | Prato | Linda Sheen's boss. |
| | Arthur | Hogue | Norm Prato's colleague. |
| | Carol | Nosler | Linda Sheen's colleague. |
| | Barry | Aninag | Irvine's PD officer. |
| | Larry | Montgomery | A lead investigator. |
| | Randy | Hill | Janelle's ex-boyfriend. |
| | Martin | Gomez | Janelle's ex-boyfriend. |
| | Philip | Michael | A lifeguard. |
| | David | Decker | A YMCA counselor. |
| | David | Thompson | Janelle's co-worker. |
| | Bruce | Wendt | Janelle's boyfriend. |
| | Tom | Hickel | Mike Martinez's friend. |
| | Mike | Martinez | Arrested for attempted marijuana possession. |
| | Jennifer | | Mike Martinez's girlfriend. Aka: Jenny |
| 9 | Larry | Pool | A senior investigator at Riverside County District Attorney. |
| | Lyman | Smith | A murder victim. |
| | Charlene | Smith | Lyman's former secretary turned as second wife. |
| | Gary | Smith | Lyman's son from his first marriage. |
| | Joe | Alsip | Lyman's former business partner. |
| | Richard | Hanawalt | Alsip's defense attorney. |
| | Gary | Adkinson | One of the lead investigator of Smith's case. |
| | Russ | Harper | A detective. |
| | Colleen | Cason | A columnist. |
| 10 | Kemo | | A protective dog. |
| | Robert | Offerman | A surgeon. |
| | Peter | | Dr. Offerman's friend. |
| | Marlyn | Brady | Peter's wife. |
| | Debra Alexandria | Manning | Dr. Offerman's girlfriend. |
| 11 | Debbi | Domingo | Cheri's daughter who run away from home. |
| | Cheryl Grace | Smith | Murdered by an intruder in Goleta. Aka: Cheri. |
| | Ellen | | Cheri's bestfriend. |
| | Hank | | Ellen's husband. |
| | Roger Dean | Domingo | An electronic technician. |
| | David | Domingo | Cheri's son. |
| | Barbara | | Cheri's aunt. |
| | Gregory | Sanchez | A computer programmer. Aka: Greg. |
| | Tabitha | Silver | Greg's new girlfriend. |
| | Cynthia | | Tabitha's close friend. |
| | Tammy | Straub | Spotted a suspicious young male gazing towards a garage. |
| | Carla | | Tammy's daughter. |
| | Cami | Bardo | A realtor. |
| | Brett | Glasby | Well-known for his nastiness and violent temper. |
| | Brian | Glasby | Brett's brother. |
| | Linda | | Debbi's grandmother. |
| 12 | Stan | Los | An FBI agent. |
| | David | Canter | A British crime psychologist. |
| | O.B. | Thomas | A detective. |
| 13 | John | Muddock | Retired chief Contra Costa County Sheriff's Crime Lab. |
| | Larry | Crompton | Detective at Contra Costa County Sheriff's Office. |
| | Jim | Bevins | An investigator of Sacramento County Sheriff's Department. |
| | Dave | Stockwell | Holes's colleague. |
| 14 | Jeff | Klapakis | A detective of Santa Barbara County Sheriff's Department. |
| 15 | George | Sellon | An architect. |
| | Kay | | A marine biologist. |
| 17 | Tony | | Michelle's neighbor. |
| 18 | Arthur | Mijares | Trying to change the name of Mount Diablo to Mount Reagan. |
| | Sid | Viscious | A bassist. |
| | Nancy | | Sid's girlfriend. |
| | Kathy | | A rape victim. |
| | Esther | McDonald | A rape victim. |
| | Pita | | A bloodhound. |
| | Betsy | | A bloodhound. |
| | Eli | | A bloodhound. |
| | Judy | Robb | Pita's handler. |
| | John | Patty | A criminalist. |
| | Joseph | Eichler | A businessman. |
| | Michael | Corbett | A developer. |
| | Judy | Corbett | Michael corbett's wife. |
| 19 | Fred | Ray | A detective of Santa Barbara County Sheriff's office. |
| 20 | Jim | Walther | A homeless man. |
| | Carl | Fabbri | A deputy at Contra Costa Sheriff. |
| 24 | Paul | Haynes | A lead researcher. Aka: Kid. |
| | Billy | Jensen | Michelle's friend. |
| | Andrew | Marquette | A witness. |
| | Larry | Oswalt | Patton's father. |
| | Kim | Rossmo | The Father of Modern Geographic profiling. |
| | Erika | Hutchcraft | An investigator of Orange County District Attorney's Office. |
| | Russ | Oase | A retired secret service agent. |
| | Colleen | Fitzpatrick | A forensic genealogist. |
