Question: What famous serial killer did Philip Carlo author a biography of?

Context articles: Cold North Killers: Canadian Serial Murder
Sun Hill Serial Killer
My Brother the Serial Killer
Kach Diyan Wanga
Philip Carlo
Juhi Rustagi
Charles Cullen
Richard Kuklinski
44 Scotland Street
Luis Garavito

Cold North Killers: Canadian Serial Murder is a 2012 Canadian non-fiction book written by Lee Mellor and published by Dundurn Press.
 It documents the lives of sixty Canadian serial killers, with the earliest being Edward H. Rulloff and the most recent being Russell Williams.
 The book uses Katherine Ramsland's interpretation of what constitutes a serial killer—someone who has killed at least two people on two separate occasions, and who attempted to or likely would have killed again—as outlined in her 2007 book "The Human Predator".
 "Cold North Killer's" own definition of what constitutes a Canadian serial killer includes both Canadians who committed murder abroad (such as Keith Hunter Jesperson and Gordon Stewart Northcott) and non-Canadians who committed murder in Canada (like William Dean Christenson and Earle Nelson).
The Sun Hill Serial Killer was a major storyline from ITV's cop show "The Bill".
 Known originally as the "River Murders", the storyline spanned several months in 2002 and served as the exit for popular cast regular Cass Rickman (played by Suzanne Maddock).
 It was the first of several serial killer storylines from the show.
 Events came to a head in the New Year of 2003, when Acting DI Samantha Nixon discovers the truth and is taken hostage by the serial killer, before a final confrontation in which she is overpowered by DC Duncan Lennox, charged and thrown into the cells at Sun Hill Station.
My Brother the Serial Killer is a 2012 American television documentary about serial killer Glen Rogers, otherwise known as the "Casanova Killer", who was convicted for a series of murders and arsons.
 The documentary was narrated by Rogers' brother Clay Rogers and aired on Investigation Discovery in November 2012.
 "My Brother the Serial Killer" received widespread media attention for Clay's claims that his brother was responsible for the 1994 murders of Nicole Brown Simpson and Ronald Lyle Goldman.
Kach Diyan Wanga is a Punjabi serial on Alpha ETC Punjabi.
 Punjabi in the U.S.
 The show started on July 11, 2011 and is still on air.
 The show is broadcast at 7:30pm India time, 6:30pm Pacific time and 9:30pm Eastern time in the U.S.
 This show is directed and written by Inderjeet, the director of the famous serial Amanat which starred Gracy Singh.
 This show was considered the launching pad of Surbhi Jyoti into mainstream Punjabi cinema and subsequently her worldwide fame after being selected to play the lead of Zoya Farooqui (later Zoya's twin daughters, Sanam and Seher) on Zee TV's critically and commercially acclaimed soap opera, Qubool Hai.
 Gul Khan the producer/director of Qubool Hai had contacted Surbhi to audition for the role of Zoya after seeing her pictures for the promotional stills of Kach Diyan Wanga.
Philip Carlo (April 18, 1949 – November 8, 2010) was a journalist and best selling biographer of Thomas Pitera, Richard Kuklinski, Anthony Casso, and Richard Ramirez.
 Carlo suffered from amyotrophic lateral sclerosis (ALS), commonly known as "Lou Gehrig's Disease".
 He was bound to a wheelchair and respirator, but retained his ability to speak normally during his lifetime.
 He died of the disease on November 8, 2010 at age 61.
Juhi Rustagi is an Indian film actress who works in Malayalam industry.
 She is now acting in very famous serial Uppum Mulakum telecasting in Flowers (TV channel) Her character name in the serial is Lakshmi and Nickname is Lachu.
Charles Edmund Cullen (born February 22, 1960) is a former nurse who is the most prolific serial killer in New Jersey history and is suspected to be the most prolific serial killer in American history.
 He confessed to authorities that he killed up to 40 patients during the course of his 16-year nursing career.
 But in subsequent interviews with police, psychiatric professionals, and journalists Charles Graeber and Steve Kroft, it became clear that he had killed many more, whom he could not specifically remember by name, though he could often remember details of their case.
 Experts have estimated that Charles Cullen may ultimately be responsible for 400 deaths, which would make him the most prolific serial killer in American history.
Richard Leonard Kuklinski (April 11, 1935 – March 5, 2006) was an American contract killer and serial killer who was convicted of murdering five people, though he likely killed at least several dozen more.
 He was associated with members of the American Mafia, namely the DeCavalcante crime family of Newark, New Jersey, and the Five Families of New York City.
44 Scotland Street is an episodic novel by Alexander McCall Smith, the author of "The No. 1 Ladies' Detective Agency".
 The story was first published as a serial in "The Scotsman", starting 26 January 2004, every weekday, for six months.
 The book retains the 100+ short chapters of the original.
 It was partially influenced by Armistead Maupin’s "Tales of the City", a famous serial story.
 It is the first book in a series of the same name.
Luis Alfredo Garavito Cubillos, also known as "La Bestia" ("The Beast") or "Tribilín" (named after Disney character "Goofy"'s Latin American Spanish name) is a Colombian rapist and serial killer.
 In 1999, he admitted to the rape, torture and murder of 147 young boys.
 His victims, based on the locations of skeletons listed on maps that Garavito drew in prison, could eventually exceed 300; Garavito continues to confess to more murders.
 He has been described by local media as "the world's worst serial killer".
 According to the Attorney General's Office and various judicial bodies, Luis Alfredo Garavito is the "second serial killer of the world."
 Likewise, the judicial body ruled that all Garavito's sentences total 1853 years and nine days in jail.