A man serving a life sentence for two first-degree murders in Durham Region is one of two men charged in connection with a prison murder that occurred more than a decade ago.

Phillip Vince, 52, was convicted in 1985 for his crimes.

More than 10 years later, in July 1999, 24-year-old Scott Barnett died at Millhaven Institution, a maximum-security prison located west of Kingston. An autopsy found he had been poisoned with cyanide, but no one was charged in the death.

In 2006, the penitentiary squad (maybe they should both be caps, or neither?), which combines OPP and Kingston Police Force investigators, reopened its investigation into the case "using a new investigative strategy," the OPP said in a March news release.

Vince, who was a Millhaven inmate at the time Barnett died, was arrested in March at the Saskatchewan Penitentiary near Prince Albert, Sask. and charged with first-degree murder in connection with Barnett's death.

He was returned to Ontario and brought before the courts in Napanee.

On Tuesday, the OPP also arrested James Maclean, 34, in Peterborough and charged him with first-degree murder in relation to Barnett’s death. They took him to Napanee for a court appearance.

MacLean had also been a Millhaven inmate at the time of the murder.

MacLean is to make a court appearance today. Vince's next court appearance is scheduled for July 6, OPP Sgt. Kristine Rae told CTV News.

No allegations against either man have been proven in a court of law.

With files from The Canadian Press