Fifteen-year-old Kyelonna Meya Smiley was supposed to be starting her freshman year of high school this month. Instead, her family is planning a funeral — and searching for answers that may never come.

On the morning of Aug. 4, Phoenix police found Kyelonna shot to death inside an apartment at a senior living community near 77th Avenue and Encanto Boulevard. It was an unlikely, and still unexplained, setting for the teenager to be in.

Investigators say the man who killed her, 67-year-old resident Nohe Prado Morelia, died by suicide just four days later. He was found at a business near 24th Street and Van Buren with a self-inflicted gunshot wound.

In a statement last week, Phoenix police confirmed they’ve closed the case, concluding Morelia was solely responsible for Kyelonna’s death. “No other suspects are believed to be involved,” the department said. “The motive remains unknown.”

For her mother, Fiyonna Austin, the official conclusion doesn’t feel like closure. She told Arizona’s Family that Kyelonna left home on Aug. 1 and was believed to be staying with a friend. When she didn’t come back by Monday, Austin filed a missing persons report. Two days later, she was told her daughter had been found dead.

“It’s very frustrating at this point. Not knowing why my baby was taken,” Austin said. “I’m really mad. And the guy who murdered my baby took a coward way to end the whole thing, took his life, and I just want to know why.”

Speaking to Fox 10 Phoenix, she added: “The person who took my baby away shattered my world. I am very, very sad and heartbroken.”

Austin says she never met Morelia and doesn’t know how or why her daughter ended up at the senior community. Kyelonna’s friends and relatives have described her as bright, funny, and full of plans for the future — plans that ended before they could even begin.

A GoFundMe page has been set up to help the family cover funeral expenses and other costs. “This is incredibly painful to share with the rest of the world,” Austin wrote in the fundraiser description. “She passed away so young and had a whole life to live.”

Kyelonna’s death is now one more entry in Phoenix’s already heavy summer of gun violence — a loss made even harder for her family because of the questions left behind. The investigation is over. But for those who loved her, the mystery of why she was there, and why she was killed, is still unsolved.