STATEN ISLAND, N.Y. -- Seventy-one-year-old Tottenville resident Joseph Labosco is serving concurrent two-year terms in federal and state prison for violating probation and drug-possession.

But they may not be his final prison sentence.

Prosecutors in Bergen County, N.J., have charged Labosco, who once served time in New York on a manslaughter conviction, with the 1980 murder of a Manhattan man in Teaneck.

Authorities believe they recently solved the cold case slaying of Wayne Eckhart, 50, based on multiple witness interviews and unspecified forensic evidence.

Eckhart's lifeless body was discovered in a remote area off Teaneck Road on Oct. 1, 1980, said Bergen County Acting Prosecutor Dennis Calo. He had been shot to death.

Despite an extensive probe by Bergen County prosecutors and Teaneck Police, no one was arrested then. The case went cold for 38 years, Calo said.

Earlier this year, the newly formed Cold Case Homicide Unit in the Bergen County Prosecutor's Office reopened the case and identified Labosco as a suspect, said Calo.

He was subsequently arrested and charged with first-degree murder based on multiple witness interviews and evidence submitted to the New Jersey State Police Forensic Laboratory, prosecutors said.

The other suspect in the case, George King, of Manhattan, died in June 2007 at the age of 76, said authorities.

Labosco's court appearance hasn't been scheduled, prosecutors said.

It wasn't immediately clear whether he has a lawyer in New Jersey.

OTHER CONVICTIONS

Labosco is well-known to authorities.

In May, he was sentenced in state Supreme Court, St. George, to two years in prison on a felony drug conviction.

The white-haired defendant was busted on Dec. 14 after cops found cocaine and drug paraphernalia in his Nancy Lane home, said authorities.

At the time of his arrest, Labosco was on lifetime supervised release resulting from a 1992 drug conviction in Brooklyn federal court in which he was also sentenced to 20 years behind bars.

Due to his Staten Island drug arrest, he was charged in Brooklyn federal court with violating the terms of his supervised release. He pleaded guilty to that charge and was sentenced in April to two years in federal prison.

Labosco's New York state sentence and federal sentence are running concurrently.

His prison stints date back to 1970.

That year, he was convicted in Manhattan of manslaughter, and in 1985 he was also convicted in that borough of attempted criminal weapon possession, show online records of the state Department of Corrections and Community Supervision.