A Canadian man who's been tried three times for the 1988 slayings of two New Hampshire women has pleaded not guilty to murder charges in his fourth trial.

The Nashua Telegraph (http://bit.ly/1EBlaw4) reports that 48-year-old Anthony Barnaby entered the pleas Tuesday on two counts each of first- and second-degree murder.

Police say Barnaby and 54-year-old David Caplin stabbed Brenda Warner and Charlene Ranstrom to death in October 1988 in the women's Nashua apartment.

Three juries failed to convict or acquit Barnaby, the last time in 1990. First-degree murder charges against Caplin were dropped after courts tossed much of the evidence. Both men returned to Canada.

They were ordered extradited in April after police said new DNA evidence and witnesses warranted another trial.

Barnaby and Caplin are being held without bail.