A man who attacked his roommate and killed his roommate’s fiancée because he didn’t want to move out of the home they shared was sentenced Friday to more than 28 years in prison.

Police and prosecutors said Kevin Bell had allowed his childhood friend, Austin Ehihu Spearman, 53, to move into his North Seattle condominium in the summer of 2010. By late in 2011, however, Bell was engaged and had asked Spearman to move out, according to court documents filed in King County Superior Court.

On Dec. 2, 2011, Bell posted eviction notices on the front door of his condo and on the door of Spearman’s bedroom, according to charging documents.

Prosecutors say Spearman did not comment on the eviction notices when he came home that night.

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But later, after Bell and his fiancée, Kristy Boyd, went to bed, Spearman rushed into their bedroom and began attacking the couple, prosecutors said.

Bell, who said he didn’t realize until later that he was being stabbed, ran out of the condo with Spearman chasing him and “still hitting him in the back and shoulder as he ran out,” court documents say.

Spearman went back inside, and the outside door shut behind him, locking Bell out of the building, prosecutors said.

Locked out, Bell could hear Boyd screaming from inside their bedroom and he “attempted to stop the assault by throwing a large rock through the bedroom window,” charging papers say. The screaming stopped before police arrived.

Boyd, 47, was stabbed at least 20 times with a large knife and died from her injuries, court documents say.

After the fatal attack, the manager of the condominiums said that Spearman was angry because he had to move out to make way for Boyd.

Spearman pleaded guilty last month to second-degree murder and first-degree assault.

Christine Clarridge can be reached at cclarridge@seattletimes.com or 206-464-8983.