Authorities in Michigan have taken a 25-year-old man into custody after he reportedly killed his fiancee, claiming she was causing a rift between him and his roommate.

Seth Thomas Martin contacted the police in Waterford Township, located near Detroit, at approximately 3:41 p.m. on Friday after he allegedly stabbed his 33-year-old fiancee, Mallory Myers, to death. When officers arrived, Martin was reportedly outside with blood on his arms. He was arrested, and after entering the residence, officers discovered Myers’s body, as detailed in a press release from the agency.

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The Oakland County Prosecutor’s Office on Monday charged Martin with first-degree murder.

During a court hearing on Monday, prosecutors presented further evidence against Martin. They stated that he and Myers were in bed together, with her using her phone while he observed, according to a report from local Fox affiliate WJBK. It was then he allegedly pulled out a knife and stabbed her multiple times, between five and ten, as per the prosecutors’ statement.

After he called 911, dispatchers asked the suspect to apply pressure on the victim’s wounds, however he said he couldn’t because there were too many, a detective told the court.

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“Seth stated ‘she’s right next to me — she’s not doing good.’ Seth told dispatch he stabbed Mallory in ‘the neck, the chest, arm a couple times,”” the detective said.

He stated to the dispatcher he stabbed her in the neck first because he “wanted it to take less time,” prosecutors said. In an interview with detectives, he recalled after he stabbed her he remembered her saying “baby, baby, baby, I’m dying. Baby I’m dying. Call the cops.” He also allegedly said he had fantasized about killing Myers with a knife “early on in their relationship,” prosecutors allege.

As for the motive, he said he felt she was driving a wedge between him and his roommate,” cops said.