Man killed in crash on Katy Freeway.

A man was driving on the Katy Freeway early Saturday morning when he lost control of his truck and crashed, according to Houston police.

The truck hit a concrete wall near Westgreen Boulevard. Police said the driver wasn't wearing a seat belt at the time, so the force of the impact threw him through the front window. He was pronounced dead at the scene.

The victim's identity was not immediately released.

Police said it's not clear what caused the driver to lose control in the first place.