Lifeblood is a children's novel by Tom Becker, first published in 2007.
 It is the sequel to "Darkside", and the second in a planned series of five.
 Jonathan Starling has remained in Darkside with Elias Carnegie.
 As with the first story in the series, the pair gets drawn into a mystery that soon turns to them trying to solve a murder.
 They are approached to discover who an unknown victim is.
 The problem is that the victim was murdered the same way as another infamous member of Darkside society twelve years ago.
 The first known murder victim had been an heir to the Ripper throne.
Carol Ann Cole (previously nicknamed as "Bossier Doe" or "Bossier's Doe" and officially known as Cold Case No. 81-018329) was a seventeen-year-old American murder victim whose corpse was discovered in early 1981 in Bellevue, Bossier Parish, Louisiana.
 The victim remained unidentified until 2015, when DNA tests confirmed her identity.
 Cole, native to Kalamazoo, Michigan, had been missing from San Antonio, Texas since 1980.
 Cole's murder remains unsolved, although the investigation is continuing.
Jim Henson's Muppet Babies, commonly known by the shortened title Muppet Babies, is an American animated television series that aired from September 15, 1984 to November 2, 1991 on CBS.
 The show portrays childhood versions of the Muppets living together in a nursery under the care of a human woman called Nanny.
 Nanny appears in almost every episode, but her face is never visible, only the babies' view of her pink skirt, purple sweater, and distinctive green and white striped socks is shown.
 The idea of presenting the Muppets as children first appeared in a dream sequence in "The Muppets Take Manhattan" (1984), released two months before "Muppet Babies" debuted, in which Miss Piggy imagined what it would be like if she and Kermit the Frog had grown up together.
Something Might Happen (2003) is a novel by Julie Myerson about a murder in a small English seaside town and how it affects the community as well as friends and family of the murder victim.
 The story is not a whodunnit although it incorporates various elements of the crime novel.
 The first person narrator is Tess, a 39-year-old osteopath and mother of four who was also the victim's closest friend.
The cleft chin murder was a killing which occurred as part of a string of crimes during 1944, and was mentioned in George Orwell's essay "Decline of the English Murder".
 It became known as the "cleft chin murder" because the murder victim, a taxi driver, had a cleft chin.
Online gambling (or Internet gambling) includes poker, casinos and sports betting.
 The first online casino was in 1994.
 Many countries restrict or ban online gambling, but it is legal in some provinces in Canada, most countries of the European Union and several nations in the Caribbean.
Buckskin Girl is the nickname given to an unidentified female murder victim discovered in 1981 in Troy, Miami County, Ohio.
 She is known for her distinct hairstyle along with the tasseled suede jacket she wore.
 The victim may have been murdered by a serial killer who had killed many prostitutes or dancers in the area, although this specific case had no indication of sexual activity.
Qiṣāṣ (Arabic: ‎ ‎ ) is an Islamic term meaning "retaliation in kind" or "revenge", "eye for an eye", "nemesis" or retributive justice.
 It is a category of crimes in Islamic jurisprudence, where Sharia allows equal retaliation as the punishment.
 Qisas principle is available against the accused, to the victim or victim's heirs, when a Muslim is murdered, suffers bodily injury or suffers property damage.
 In the case of murder, Qisas means the right of a murder victim's nearest relative or Wali (ولي ) (legal guardian) to, if the court approves, take the life of the killer.
Robert Creed Norman (born April 12, 1969) is a South Florida journalist who joined WPLG-Channel 10 in 2011 as an on-air investigative reporter.
 Previously he worked for several years as a weekly newspaper and online columnist who first broke the corruption story of $1 billion Ponzi scheme operator Scott Rothstein's October 27, 2009 flight to Morocco under suspicious circumstances.
 Rothstein, who returned to face inquiries, is a former Fort Lauderdale attorney investigated by the Federal Bureau of Investigation and arrested on 1 December 2009.
 In 2008 Bob Norman reported an unusual circumstance following the murder of Melissa Britt Lewis, employee of Rothstein Rosenfeldt Adler (RRA) law firm, wherein the prosecuting attorney in the Lewis murder case came to work with RRA two months after the murder.
 Rothstein has not been connected to the murder, however murder victim Ms. Lewis had been close to Debra Villegas, RRA Chief Operating Officer, whose husband Tony Villegas was identified as the murderer by the City of Plantation Police represented by Scott Rothstein.
Adam Anhang Uster (March 8, 1973 – September 23, 2005) was a businessman and founder of an Online gambling enterprise; he was murdered at the intersection of Calle San Justo and Calle Luna in Old San Juan, Puerto Rico on September 2005.
 He was leaving the Pink Skirt Nightclub/Dragonfly Club with his estranged wife, Áurea Vázquez-Rijos, from whom he was finalizing a divorce, and was knifed and beaten to death on the street.
 The event was highlighted as the "Pink Skirt Murder" in a television expose on Dateline NBC.
 Ms Vázquez-Rijos who had only been married to Mr Anhang for six months suffered minor injuries during the attack.

Question: What activity, restricted or banned in many countries, was the business of the murder victim of the "Pink Skirt Murder"?
Answer: Online gambling