EASTON, Md. (AP) _ A 17-year-old boy who admitted stabbing and bludgeoning his sleeping family to death after getting up for a glass of water has been sentenced to 90 years in prison.

Michael Fisher pleaded guilty Tuesday to second-degree murder for killing his mother, Susan Fisher, 41, his stepfather, Christopher Fisher, 27, and his brother, David, 14.

Prosecutor Scott Patterson read Fisher's confession, in which the teen-ager said he ``snapped'' early the morning of Feb. 19, 1996.

Fisher said he picked up a hammer and butcher knife from the kitchen and went to his mother and stepfather's bedroom. After watching them sleep for a few minutes, he attacked them.

``It was like I tried to stop but I couldn't. It was like I was pushed aside,'' Fisher said in the confession.

He said he ``came to'' a couple of minutes later and went to his brother's room. ``I went nuts. I tried for his throat ... When I came back, he was dead too,'' he said.

Fisher then showered, changed his clothes, hid the weapons and called police, Patterson said.

Fisher had originally entered an insanity plea. He changed his mind because he didn't want to put his relatives and acquaintances through the ordeal of a trial, said his attorney, Donna Shearer.

``His life is over,'' Ms. Shearer said. ``He has expressed his remorse constantly.''

Neither Fisher nor his attorneys offered a motive. But Ms. Shearer said her client had been diagnosed with schizophrenia by psychiatrists.