BELLINGHAM, Wash. -- Isaac Zamora was officially sentenced to life in prison with with no possibility of parole Monday after pleading guilty earlier to a shooting rampage in Skagit County that left six people dead, including a sheriff's deputy, in September 2008.

Zamora pleaded guilty on Nov. 17 to 18 of 20 counts against him, including murder, attempted murder and burglary. Six people were killed and four others wounded in the shooting rampage that began in Alger.

For the other two counts, Zamora pleaded not guilty by reason of insanity. Those two counts are for the deaths of Skagit County sheriff’s deputy Anne Jackson and Alger resident Chester Rose, the first person killed.

Prosecutor Rich Weyrich said Zamora’s mental illness and public safety led to his decision to accept Zamora’s pleas.

The other four people killed were Julie Binschus, 48; Greg Gillum, 38; David Radcliffe, 58; and Leroy Lange, 64.

Zamora will be confined to Western State Hospital.