A black woman was shot dead by police through a bedroom window on Saturday morning, following a request to check on her welfare.
Atatiana Jefferson, 28, had been staying at the Fort Worth residence with her eight-year-old nephew.
A neighbour said he called a non-emergency number after becoming worried in the early hours about an open door.
Police have released body cam footage of the incident, which shows a confrontation lasting only seconds.
The clip shows officers circulating the perimeter of the residential property and spotting a figure at the window. After demanding the person put their hands up, an officer then fired a shot through the glass.
The Fort Worth Police Department said in a statement that the officer, who is a white man, had “perceived a threat” when he drew his weapon.
He has been placed on administrative leave pending an investigation, officials added.
The shooting happened at about 02:30 local time (07:30 GMT) on Saturday morning.
Although it is edited, the body cam footage does not appear to show the officers identifying themselves as police.
It does not show footage from inside the property but includes images of a weapon that police say they found inside the bedroom.
It is unclear if Ms Jefferson was holding a weapon at the time, but firearm possession is legal for people aged over 18 in Texas.
Police said officers provided emergency medical care to Ms Jefferson at the scene, but she was declared dead at the property.