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Heike Poike, her 2-month-old granddaughter Lyrik Poike and Dakota Smith were murdered in 2015

Alexander Hung Tran, who owned the residence where Heike and Lyrik lived, was convicted of the murders in August

Authorities say Tran had a growing obsession with Lyrik's mother and wanted to have a child with her

An Utah man has been sentenced to life behind bars 10 years after killing a 63-year-old grandmother, her infant grandchild and a friend of the family.

Heike Poike and her 2-month-old granddaughter Lyrik Poike were found slain alongside Dakota Smith in a Salt Lake City, Utah residence in September 2015.

Alexander Hung Tran was immediately identified as a suspect. On Aug. 23, he was convicted in their murders, the Salt Lake County District Attorney's Office said a state

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