A grand jury today indicted Arthur J. Shawcross in the murder of 10 women over the past two years.
District Attorney Harold Relin said the jury acted after hearing about 40 witnesses over two days.
Police had already charged Shawcross, 44, with eight of the slayings after his arrest Jan. 3. He also has been charged with the choking death of a woman in Wayne County, east of here.
Shawcross, who was paroled in 1987 after serving 15 years in prison for the strangling of an 8-year-old girl in Watertown, reportedly confessed to the serial murders after his arrest.
State troopers spotted Shawcross sitting in a car near the frozen body of one of his victims.
Police said most of the victims, whose bodies were found between March 1988 and Jan. 4, were prostitutes or heavy drug users. Most of them were strangled or suffocated.