he was shocked to find out the news.
He said: "We know what we need to know and sometimes things happen that you don’t want to put a reason on.
"Of course we are angry but we know the girls would want us to celebrate their life… the outpouring of support from the kids is amazing."
Natasha had just graduated from Forney High School on June 1 while her younger sister Alexa was a sophomore.
A friend posted a picture of the sisters, who were in the high school band, on graduation day.
Tributes to the girls have flooded social media, as their classmates remember them both as "bright, beautiful and talented".
Riley Warren, the percussion director at Forney High School, said: "Please keep the mother of these girls in your prayers as the Forney community heals from the tragic loss of two incredibly bright and talented young people. I’m at a loss for words…"
Friend Gwen Keem commented on a GoFundMe page: "Natasha is and always will be my best friend. She was loved by me and my whole family. I was with her the morning before and I'm forever heartbroken."
Detectives are still trying to determine a motive.
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