Colleyville firefighters found a body Tuesday morning on the second floor of a residence that was destroyed by a fire, officials said.
A man, a woman and a baby escaped the blaze, which was reported shortly after 1 a.m. in the 3500 block of Blue Quail Lane.
The body, found about 10 a.m., had not been identified by late Tuesday.
A 17-year-old girl, whom authorities did not identify, was seen going upstairs about 10:30 p.m. Monday, city spokeswoman Mona Gandy said.
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No other injuries were reported.
Colleyville firefighters arrived to find the two-story house engulfed in flames.
Firefighters from Colleyville, Bedford, North Richland Hills, Keller, Hurst and Southlake helped extinguish the blaze within an hour, officials said.
The cause was under investigation.