A man was arrested after Boulder police say he stabbed another man eight times — including in the neck — after an argument on University Hill on Tuesday.

Christopher Shane Boyce, 27, was arrested on suspicion of first-degree assault in the stabbing of Anthony Amor, though Boyce told police the act was in self-defense.

According to an affidavit, Amor and his girlfriend, Aisha Summer, were walking just after midnight Tuesday on 13th Street just south of Pennsylvania Avenue when Boyce began to make sexual comments toward Summer.

Summer told police Amor verbally confronted Boyce and then “went at him (Boyce).” She said the two men began to fight, and Amor stumbled away from Boyce bleeding from the neck and his side saying, “I got stabbed because of you.”

Amor was transported to a hospital, where doctors said he had been stabbed eight times, twice in the neck, three times in his chest and three times on his left side.

Boyce left the area but was followed by employees from a nearby business who witnessed the fight, and police were able to track him down near Broadway and Grandview Avenue.

According to the affidavit, Boyce told police that he had seen Amor and Summer “around” and said he had “interacted” with Summer earlier that night. He said when he saw her a few minutes later, she punched him in the face.

Boyce claimed that Amor then also challenged him to a fight and began to punch him. Boyce said he took out a pocket knife and that he stabbed Amor in self-defense.

Police found a folding knife with blood on it in Boyce’s possession, and also noted he had blood on his hands and a small cut on his right hand.

Boyce is originally from Las Vegas but is currently homeless in Boulder, according to the affidavit. He has one prior arrest in Colorado, an indecent exposure case out of Jefferson County.

He is being held on $100,000 bond as he awaits a formal filing of charges on Thursday.

Mitchell Byars: 303-473-1329, byarsm@dailycamera.com or twitter.com/mitchellbyars