Surveillance photos show the two suspects inside the convenience store on Reed Road just off Highway 288.
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One of the armed men was wearing what looks like an alien mask, while the other wore a black mask.
Officers found the clerk dead inside the Valero.
Police say the two masked men took off in a dark-colored Nissan.
Houston police believe the masked men didn't steal anything. The two left quickly after the deadly shooting.
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They say the victim, a 29-year-old Palestinian man, was a recent immigrant to the United States.
"This is horrible. This man, 29 years old, came to this country for a better life, to support his family, and he gets gunned down for it ... it's not right. These guys need to be caught," Lt. Meeler with HPD Homicide said.