Barbara Richardson

As of January 2017, Susan Launius is both the sole survivor of the Wonderland murders and the only living member of the Wonderland Gang.

In the years following the Wonderland murders, McCourt was reported to have moved to Colorado. He spent considerable time in the Colorado prison system, but when he was free he operated a successful mobile phone franchise. In 2001, he reportedly had been wanted by the Colorado Springs Police Department for "assault with a deadly weapon and failure to comply on the original charge of distribution of a Schedule II controlled substance".

In 1990, Nash was charged in California state court with having planned the murders, and Diles was charged with participating in the murders, but both men were acquitted in 1991. Diles died in 1997 from liver failure.

Following the robbery, Holmes ended up back at Nash's home. Accounts vary as to how and why Holmes arrived there; according to some sources, Holmes went there himself to try to make himself appear innocent, whereas others claim Holmes was kidnapped by Nash's henchmen when they recognized him walking around wearing some of Nash's jewelry. Scott Thorson, who was buying drugs at Nash's home, wrote in his memoir My Life with Liberace (1988) that Nash had ordered Diles to bring Holmes to Nash's house, which Diles did after finding Holmes walking around Hollywood wearing one of Nash's rings. Thorson claimed to have witnessed Nash order Diles to beat Holmes, and said Nash threatened to kill Holmes and his family, until Holmes identified the people behind the robbery.

John Holmes was arrested and charged with four counts of murder in March 1982, after his handprint was found in one of the bedrooms. Holmes was acquitted in June 1982, after a three-week trial. It determined that he was an unwilling participant who was forced to watch the attack. He spent 110 days in jail for contempt of court. Holmes died on March 13, 1988, from AIDS complications in Los Angeles.

The Wonderland Gang was a group of drug dealers involved in the Los Angeles cocaine trade during the late 1970s and early 1980s; their home base was located on Wonderland Avenue in the Laurel Canyon section of Los Angeles, California. On July 1, 1981, three members and one associate of the gang died in the Wonderland murders (also known as the "Four on the Floor murders" or the "Laurel Canyon murders").

David Lind, ordinarily a resident of the Sacramento area, came to Los Angeles in the summer of 1981 at Launius' behest, to aid in their growing drug-distribution business. Lind and Launius had become friends while in prison and promised to deal drugs together upon their release. Lind and his girlfriend, Barbara Richardson, rode down to the Wonderland house on Lind's motorcycle and slept on the living room sofa.

David Clay Lind was a biker, heroin addict, and member of the Aryan Brotherhood who befriended Launius when the two men served time in prison together. In 1981, at Launius' behest, Lind traveled to Los Angeles to join the Wonderland gang and assist them in running drugs. By the time of the Wonderland murders, Lind had been incarcerated several times for armed burglary, forgery, assault, and assault with the intent to commit rape. Specifically at the time of the murder, Lind testified in court that he was at a motel in the San Fernando Valley, consuming drugs with a male prostitute. Lind's position in the drug underworld was and remains murky due to allegations by rival drug dealers that he worked as a police informant.

Susan A. Murphy Launius, 30, while not an official member of the gang, was married to gang member Ron Launius and had a drug habit. She is the sole survivor of the brutal Wonderland attack the night of July 1, 1981; she suffered severe head injuries, amnesia, and a severed finger following the attack.

On June 29, 1981, the Wonderland Gang, comprising Ron Launius, Billy DeVerell, David Lind, Tracy McCourt, and their associate, John Holmes, conspired to launch a home invasion and robbery upon Eddie Nash, a reputedly powerful organized crime figure who usually referred to himself in the third person as "The Nash". The robbery was an inside job set up by Holmes, who was a close associate of Nash's, and whom Nash regularly referred to as "my brother". Early in the morning of the robbery, Holmes visited Nash's mansion ostensibly to party and to buy drugs, but on his way out, left the patio door to the kitchen unlatched. The objective of the robbery was to steal a hoard of cash, heroin, and cocaine that Holmes claimed was in a safe embedded in Nash's bedroom floor, as well as to retrieve some antique guns the Wonderland Gang had stolen from another businessman and then subsequently, using Holmes as an intermediary, sold to Nash in exchange for drugs.

Tracy Raymond McCourt was the driver of the stolen 1975 Ford Granada that carried the Wonderland Gang to Eddie Nash's home on the night of the robbery. Originally, McCourt was designated to take part in the home invasion itself, but a day or so before the event, conspirator David Lind (who derisively referred to McCourt as "Titmouse Tracy") took away McCourt's handgun, and McCourt was relegated to driving duty.

Reportedly, at the time of his death, police investigators throughout California, largely in the Sacramento area, had 27 open homicide cases they believed were perpetrated by Launius. In May 1974, he was arrested for and charged with the 1973 murder of a reputed police drug informant who had been killed over a botched drug deal. After a key witness for the prosecution died in an unrelated police shootout, the murder charges against Launius were dropped. That year, however, Launius was convicted of smuggling heroin and cocaine across the US/Mexico border and eventually served three years of an eight-year sentence in a federal prison.

Launius was known for remaining composed under pressure. His associate, David Lind, once said of him: "You could put a gun to his head and his pulse would never break 70". Launius' brazen and fearless nature led both to his dominance of his chosen profession as well as his demise, stemming from the events leading up to his death in the Wonderland Murders. Launius and Susan Murphy, were married in Carson City, Nevada on April 16, 1971.