Police said the victim, who has not been named, fell asleep at the wheel while driving with his son and daughter in the backseat. A family friend was also in the front of the vehicle with the victim.
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Their vehicle was headed down the eastbound lanes of U.S. 290, just before FM 362, when the man apparently drifted off the road and slammed into a guardrail.
Accident investigators said the impact flipped the car into the air before it landed right-side up on the highway.
The victim's daughter was thrown from the vehicle. Police said when the man tried to help his daughter, a second vehicle passing the crash slammed into him.
RELATED: Father, daughter in critical condition following tragic accident
Both the victim and his daughter were taken by Life Flight to Memorial Hermann Hospital in critical condition.
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The man died after undergoing surgery. An autopsy has been scheduled for today.
There is a GoFundMe account to raise money for the man's family.
The daughter is said to be okay, according to a family member.
The family friend and the man's son were alert and talking when they were taken to the hospital, as a precaution.
The friend said the victim was wearing his seatbelt when the wreck occurred. It is unclear if the man's daughter was wearing her seatbelt.
The wreck shut down a portion of Highway 290 for several hours.