 In Maine, a man who confessed to killing his parents and two of their friends and wounding three people in a highway shooting has been sentenced to life in prison. Joseph Eaton pleaded guilty to murder and other charges shortly before he was sentenced yesterday. He previously had entered in an insanity defense in connection with the crimes committed in Maine but withdrew it late last year. Anguished family members of the victims gave emotional testimony before the sentencing and Eaton apologized to them later.