'One person was killed and three were injured in a shooting at a Brentwood gym early Thursday morning in what started as a fight, according to police.  Stay connected:  Follow us on Twitter: http://www.twitter.com/nbcbayarea  Like us on Facebook: http://www.facebook.com/nbcbayarea  Follow us on Instagram: http://www.instagram.com/nbcbayarea  Follow us on TikTok: https://www.tiktok.com/@nbcbayarea   Catch up on all the day\'s news:  http://www.nbcbayarea.com   Download our mobile app:  On iOS: http://nbcbay.com/R1BhqYM  On Android: http://nbcbay.com/rUcA97h  Watch us on OTT: Add our channel on Roku: https://bit.ly/3ySK60j Download our app on Amazon Fire TV: https://amzn.to/3FmmiEA' 

Tags: 24 hour fitness , Contra Costa County , fatal shooting , Brentwood , gunbattle

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