sitting in a car, 18-year-old holly lai, her 15-year-old sister michelle, and three other friends. >> really bad feeling, a knot in my stomach that told me something was going to happen. >> reporter: they were approached by a rowdy group. among them tyra and 22-year-old la ha la shoouna keeney who has a gun. >> holly lai called out for me, she said please make them stop, please tell them we don't have anything. >> what did you say to them? >> i walked up to lashawna keeney and was like why don't you chill out. and that's when she brandished the gun. >> reporter: tyra heads back home but back at the car the situation is escalating. >> there was a girl at my sister's door trying guite necklace off my sister and couldn't do it. that's when she took the gun across me. and i turned and she shot her right in front of me. >> we heard a gunshot. we actually thought they were shooting at us. >> reporter: holly's sister michelle shot dead right in front of her eyes. >> i remember falling to the ground going why? please somebody help us. and i start running door to door to door just pounding on