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Eighteen-year-old Rylee Goodrich was attending a screening of The Forever Purge at a cinema in Corona alongside her new boyfriend, 19-year-old Anthony Barajas, when they were shot from behind.
Her dad, David Goodrich, told MailOnline: "She was so f***ing happy.
"I could tell she really, really liked this boy. And he really, really liked her."
Goodrich went on to explain how his daughter met Barajas on 4 July, but their visit to the cinema was the first time they'd been out together alone.
He continued: "They were so excited for their first date,
"She curled her hair all pretty."
Goodrich said that Barajas - a TikTok star with more than one million followers - took Rylee to 'her favourite restaurant' before they went to the theatre to see the latest instalment in the Purge franchise.
She was even texting her mother right up to the point when she was shot.
Goodrich said: "She texted my wife how boring and stupid it was, how she didn't like the movie.
"That was the last we heard from her."
According to her dad, Rylee was shot 'point blank behind her head', as well as Barajas.
"She never even had a chance... Then [the perpetrator] shot her new boyfriend behind his head," he said.
"I don't know if they've taken him off life support but I think he's brain dead."
Only six tickets were sold for the showing of the film, and the pair weren't discovered until after the film had ended.
Twenty-year-old Joseph Jimenez was arrested on Tuesday and charged with murder, attempted murder and robbery.
A gun of the same calibre as the murder weapon was discovered at Jimenez's house, as was Rylee's wallet.
Corona Police Department said: "There is no known motive and it appears to be an unprovoked attack."
Rylee's dad explained how he'd first 'rolled his eyes' upon discovering that Barajas was a TikTok star, but came around to him after he brought the family souvenirs from a trip to Hawaii.
He explained: "It was the sweetest thing I've ever seen [a teenager] do."
Furthermore, he said he realised that the young man 'had his head screwed on straight' after learning how he monetised his large online following.
Goodrich concluded: "I'm really protective and I wanted her to meet a guy who's going to be compassionate and sensitive... and he seemed like that guy."
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