A former nurse's aide imprisoned after admitting that he killed 37 people in Ohio and Kentucky now says he remembers killing another seven people, authorities said Thursday.

Hamilton County Prosecutor Arthur Ney Jr. went to the Southern Ohio Correctional Facility in Lucasville Thursday to interview Donald Harvey and determine if his newest claims are true.Ney reached an August 1987 plea agreement with Harvey in which the former nurse's aide would remain behind bars for 60 years. Ney has vowed to follow every new lead provided by the public, police or the news media, said Charles Gerhardt, an assistant to Ney.

William Whalen Jr., Harvey's lawyer, planned to be at the Lucasville prison for Thursday's interview of Harvey, Whalen's office said.

Harvey, 37, is serving three life prison terms in the slayings. The killings to which he has confessed rank him among the most prolific killers in the nation.

Harvey admitted killing 24 patients at Drake Memorial Hospital in Cincinnati while he worked there as a nurse's aide from 1985 until his April 1987 arrest.

He also admitted killing nine patients while he was a nurse's aide at Marymount Hospital in London, Ky., in 1970-71 and killing four other people he knew during the same period. Harvey says he poisoned most of his victims - many of them bed-ridden - but suffocated others with plastic bags.