Police are searching for the shooter who gunned down a man at a northwest Houston apartment complex Sunday night.

According to investigators, the gunman shot the victim in the courtyard of the Shadow Creek apartments on Pinemont Drive.

Witnesses told police they heard the victim say in Spanish "No Senor" (No Sir) several times before they then heard several gunshots. 

The victim, believed to be in his 30s, stumbled to his apartment where he collapsed and died.

Homicide detectives say they do not have a motive or a description of the shooter.

The victim's name was not immediately released.

Anyone with information on this incident is asked to call the HPD Homicide Division at 713-308-3600 or Crime Stoppers at 713-222-TIPS.