The Montgomery County Sheriff's Office said deputies responded at about 3:45 a.m. to a report of an unresponsive man lying along the road after being hit by a vehicle near FM 1485 at Willaby Road.
Officials said the man, whose identity was not revealed, was pronounced dead at the scene.
Authorities said the vehicle involved left the scene after the crash. MCSO said its Traffic Division deputies responded to the scene, along with the Montgomery County District Attorney's Office and the Montgomery County Death Investigators Office.
MCSO said the investigation remains ongoing, adding that the roadway and surrounding area were closed as deputies processed the scene.
Officials said anyone with information about the incident is urged to contact the Montgomery County Sheriff's Office at 936-538-5900 and reference case number 26A318298. Those wishing to remain anonymous may contact Multi-County Crime Stoppers at 800-392-7867.