A Maine man charged with killing his girlfriend and her two children has pleaded not guilty to three counts of murder.

Twenty-seven-year-old Keith Coleman, of Garland, entered the plea Friday afternoon in Superior Court in Bangor. He has been charged in the deaths of 36-year-old Christina Sargent, 10-year-old Duwayne Coke and 8-year-old Destiny Sargent.

Coleman has been held without bail since his arrest.

Investigators say the bodies were found Dec. 20 in a mobile home Coleman shared with the victims.

A court affidavit says Coleman told investigators he chased down and strangled the children because they had witnessed their mother's death.