Jaaron Thomas, 27, faces manslaughter charges in the strangling death of his 24-year-old girlfriend.
Harris County Sheriff's Office deputies responded to the 800 block of Ashland Boulevard near Woodforest at about 2:20 a.m. in regard to an unknown medical emergency.
When authorities arrived, they found a woman unresponsive from "unknown causes."
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She was transported to the hospital, where she was pronounced dead.
Thomas, identified as the woman's boyfriend, told deputies they were engaged in a sex act described as "erotic asphyxiation" when she went unresponsive.
Thomas has posted bond and is out of jail.