The victim told detectives that he and a woman checked into a motel in the 13000 block of Westheimer in the early morning hours of Sept. 28.
The woman was getting out of the shower when someone knocked at the door and she opened it, investigators said. Two men entered and attacked the victim, hitting him in the head, knocking him to the floor and demanding his property. One of the intruders shot the victim in the head at point-blank range, the arrest warrant states.
The suspects fled and the woman took the victim's 2003 Saturn, later found burned in a nearby apartment complex.
The victim's phone records led detectives to Shannon Earl Parker, 36, who faces a felony charge of aggravated robbery with a deadly weapon, according to the arrest warrant. Parker remained at large on Thursday.
The victim was treated for non life-threatening injuries.
Anyone with information about the case is asked to call the Harris County Sheriff's Office at 713-967-5810 or Crime Stoppers at 713-222-8477 (TIPS).