It appears that New York's notorious "preppie killer" is going back to jail.

Robert Chambers Jr., who will turn 42 next month, became infamous in 1986 after pleading guilty to manslaughter in the murder of Jennifer Levin in Central Park. Fifteen years in prison he had served for strangling her, during a violent sex act, the New York Times reported. In addition to the killing, he shocked a whole nation when a videotape came to light, showing him twisting off a doll’s head and saying: “Oops, I think I killed her.”

Yesterday, after about 22 years, he admitted to selling cocaine out of his apartment, together with his girlfriend, Shawn Kovell, said Alicia Maxey-Greene, a spokeswoman for the Manhattan district attorney’s office.

Maxey-Green also said that, in his court appearance in Manhattan, after pleading guilty to selling powerfully addictive stimulant drugs, the so-called preppie killer agreed to serve 19 years and 4 months in prison. He is to be sentenced in the coming months.

In October 2007, Chambers was detained after undercover officers bought drugs in his apartment located on E. 57th St., where he lived with his companion Shawn Kovell.

It appears that the man has fought with narcotic addiction since he was in the adolescent period. Three years ago, he was busted after getting caught red-handed in New York City’s Harlem neighborhood with both cocaine and heroin.

"He's an individual who should never walk among us again," said Linda Fairstein, one of America's foremost legal experts on crimes of sexual assault and domestic violence and the lead prosecutor in Chambers' 1988 murder case. "Clearly, he's been unwilling to accept the help he's needed."