Lt Scott Spencer of Montgomery County Sheriff's Office said it was still unclear why she was wearing restraints, adding: "We only have one side of a story right now".
When they arrived, they found the body of the woman's 48-year-old boyfriend inside the house.
Montgomery County Sheriff's Office officials told Breitbart Texas they could not release the woman's identity because she is a victim of domestic violence and sexual assault.
The woman, who appeared to be pregnant, was partially dressed, wearing a t-shirt and broken wrist shackles. The female is confirmed to be safe and with family.
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The woman was captured on a surveillance camera approaching a home in Montgomery County in Texas at around 3.20am local time but before anyone could answer the door she was gone. She described the restraints seen in the video as the type used in "private intimate encounters", police said. In his suicide note, he referenced his girlfriend, who investigators were able to confirm was the woman in the video. Officers reportedly launched a "door to door" investigation, asking residents of the small town for information. After the mystery woman was identified and found safe yesterday, deputies revealed that the man who was reportedly her boyfriend and who took his life was Dennis Ray Collins.
She was 19 years old when reported missing, but turned 20 on August 7th.
The man's girlfriend, identified by the sheriff's office as a "family violence victim", has been confirmed by deputies as the woman captured on a doorbell camera last Friday. My husband was woken up by (the) doorbell ring (ing).
The death is believed to be suicide, police said.
A Montgomery County Sheriff's detective responded to questions about the mystery woman at a 2 pm news conference today.