SCHENECTADY — A Schenectady County grand jury Wednesday indicted Heaven Puleski on murder and manslaughter charges for allegedly killing her three-month-old son Rayen in a crime prosecutors say involved "violent shaking and throwing."

Puleski, 38, pleaded not guilty before Judge Matthew Sypniewski in County Court to a six-count indictment that comes nearly two months after she was initially indicted on allegations she wrapped Rayen Puleski in plastic bags and buried the infant in a hole in her backyard at 766 State Street.

"The allegations involve conduct of violent shaking and throwing along with (Puleski's) failure to seek any kind of medical assistance or medical attention -- and ultimately her concealment and disposal of his body," Assistant District Attorney Christina Tremante-Pelham told reporters, standing beside District Attorney Robert Carney outside the courtroom after the arraignment.

The indictment said the child died between July 17 and Aug. 9. It charged Puleski with second-degree murder, which carries 25 years to life in prison upon conviction. The prosecution's theory of the crime is Puleski killed her child under "circumstances evincing a depraved indifference to human life" and that she "recklessly engaged in conduct which created a grave risk of serious physical injury or death" to the child, which caused his death.

Other counts include first-and-second-degree manslaughter, concealment of a human corpse, tampering with physical evidence, all felonies, and endangering the welfare of a child, a misdemeanor.

Originally held on $20,000 bail, Sypniewski ordered Puleski jailed without bail. Puleski's attorney, Lara Barnett, who said her client was expecting the indictment, had asked the judge to keep bail at $20,000. Tremante-Pelham noted Puleski had a history that includes a conviction for third-degree escape and has missed prior court appearances.

The prosecutor provided the judge with documents showing that prosecutors' evidence includes statements to police by Puleski, including some on videotape, on Aug. 8 and Aug. 14.

In August, Puleski was arrested on the lesser charges after police found the body of the infant on Aug. 9 in a hole behind the State Street apartment they shared.

The Times Union previously reported that Puleski initially told authorities she was high on heroin, fell asleep and ended up on top of Rayen, according to several people with knowledge of the ongoing probe who spoke on condition of anonymity. They had said Puleski said she awoke to find her child not breathing.

Rayen had been under the supervision of child protective services in Saratoga County. Schenectady County's child protective workers took on the case when Puleski moved there.

The defendant's aunt, Lisa Dutcher, told reporters in August she last saw the child in June when the mother and baby were living in a Saratoga Springs motel.

"He was healthy. He was fine. He gained a lot of weight. He was chunky," said Dutcher, who led an effort to get police and social services workers to search for the baby after he vanished in mid-July.

At the time, Dutcher said her niece moved to Schenectady to escape the cramped motel room.

"She jumped on an apartment she thought would be great for the baby," Dutcher said. She said said her niece -- who lost custody of her two other children -- had struggled with drug problems.