Texas

Man shot dead while trying to stop man from beating woman

  • San Antonio police investigate the scene of a shooting in the Wal-Mart parking lot in San Antonio, Friday, Nov. 25, 2016. A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in the crowded San Antonio parking lot. The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio. (Bob Owen/The San Antonio Express-News via AP)

    San Antonio police investigate the scene of a shooting in the Wal-Mart parking lot in San Antonio, Friday, Nov. 25, 2016. A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in the crowded San Antonio parking lot. The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio. (Bob Owen/The San Antonio Express-News via AP)  (The Associated Press)

  • San Antonio police investigate the scene of a shooting in the Wal-Mart parking lot in San Antonio, Friday, Nov. 25, 2016. A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in the crowded San Antonio parking lot. The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio. (Bob Owen/The San Antonio Express-News via AP)

    San Antonio police investigate the scene of a shooting in the Wal-Mart parking lot in San Antonio, Friday, Nov. 25, 2016. A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in the crowded San Antonio parking lot. The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio. (Bob Owen/The San Antonio Express-News via AP)  (The Associated Press)

  • San Antonio police investigate the scene of a shooting in the Wal-Mart parking lot in San Antonio, Friday, Nov. 25, 2016. A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in the crowded San Antonio parking lot. The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio. (Bob Owen/The San Antonio Express-News via AP)

    San Antonio police investigate the scene of a shooting in the Wal-Mart parking lot in San Antonio, Friday, Nov. 25, 2016. A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in the crowded San Antonio parking lot. The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio. (Bob Owen/The San Antonio Express-News via AP)  (The Associated Press)

A man has been killed and a woman critically wounded when police say the man tried to stop another man from beating a woman in a crowded San Antonio parking lot.

The incident happened Friday afternoon outside of a Wal-Mart in northwestern San Antonio.

Police Chief William McManus says a man was assaulting a female companion when the good Samaritan drove up and demanded that he stop. McManus says the assailant drew a handgun and fired at the man, killing him and critically wounding a female bystander. A woman in the vehicle with the good Samaritan was injured by shattered glass.

McManus says the beaten woman escaped and a police helicopter followed the suspect's vehicle for 10 miles before his arrest.

No identities have been released.