A man charged with murder escaped from jail early Saturday by climbing through an air conditioner vent, authorities said.

The vent was less than a foot wide, and authorities said Darryl Layne Norris had been losing weight since arriving at the Waller County Jail in April.

The jail noticed the 6-foot, 160-pound man was missing after performing a routine head count.

Norris, 26, and another man are charged with murder in connection with an April 17 convenience store robbery.