WARREN — A man serving a pair of life sentences for a 1988 murder died at the Maine State Prison on Monday night.

Scott Fish of the Maine Department of Corrections confirmed in a Tuesday statement the death of Edward Robinson Jr., 77.

The cause of Robinson’s death was not disclosed, and he died shortly before midnight, according to Fish.

State police and the chief medical examiner were notified, as is standard protocol, and both are reviewing Robinson’s death, Fish said.

According to Bangor Daily News archives, Robinson was responsible for the 1988 shooting deaths of Robert Blanchard and Patricia Maguire at a Bangor trailer park.

Robinson was sentenced to two life sentences in December 1990.