A Florida man was placed under arrest over the weekend after he admitted fatally shooting his wife during a domestic dispute.

Port St. Lucie Police on Sunday responded to a call from 21-year-old Chekingson Sinclair, who said that he had shot his wife, Argrett, according to WPBF.

Responding officers found the pregnant woman dead at the scene when they arrived.

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Investigators determined that an argument between Sinclair and his wife began at around 6:30 a.m. on Sunday in their bedroom. The suspect said that he had thrown his wife’s phone into the toilet, and she had chased him around the house with a kitchen knife.

But Sinclair said that the victim could not catch him, so she locked herself in the bedroom. He explained how he retrieved a gun from underneath a recliner in the living room, and went to the bedroom to confront her. The argument escalated, until Sinclair said that Argrett lunged at him with the knife.

He pulled the trigger, and she fell to the floor. But she got up again, so he shot her in the head, he told investigators. Sinclair then waited three hours before notifying police.

Detectives, however, said that Argrett had sustained a gunshot wound to the back of her head at close range.

After admitting that he wanted to kill his wife, Sinclair was charged with first-degree premeditated murder, murder of an unborn child and tampering with evidence.

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Watch the video below from WPBF, broadcast Oct. 26, 2014.