A Las Vegas man will spend the rest of his life behind bars for a murder rampage that took the life of his grandmother and two others.

In July, Spencer McDonald , 32, entered pleas of guilty but mentally ill for each of three murder charges – ensuring prosecutors would not seek the death penalty in the gruesome case that saw the defendant spend significant time with the corpses of his victims after the fact.

The days-long spate of violence took the lives of McDonald's grandmother, Dina Vail, 80, her boyfriend, Andrew "AJ" Graden, 43, and apartment maintenance worker Christopher Brassard, 45.

On Tuesday, the defendant was sentenced to life in prison without the possibility of parole by a judge in Clark County, Nevada .

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