A Utah man, Alexander Hung Tran, will spend the rest of his life in prison following his conviction for the murder of three people, including a 2-month-old infant. Tran, aged 42, received three life sentences without the possibility of parole for the brutal killings that stemmed from an unsettling fixation on the baby’s mother.

The Salt Lake County District Attorney’s office announced the sentencing, which came after Tran was found guilty in August on three counts of first-degree felony aggravated murder. The victims included 63-year-old Heike Poike, her 2-month-old granddaughter Lyrik Poike, and 29-year-old Dakota Smith, who were all shot to death.

The grim events unfolded on September 18, 2015, when police were called to a Salt Lake City residence after Heike Poike failed to pick up her grandson from school. Upon arrival, officers noticed the back door was ajar and, entering the premises, discovered the tragic scene. Tran was found in the basement, armed, and was subsequently arrested.

The Poike family had recently moved into the home owned by Tran’s mother, with the family occupying the upper floors while Tran resided in the basement. Tensions rose as Tran became increasingly obsessed with Ashley Poike, Heike’s daughter and the mother of infant Lyrik, bombarding her with messages expressing his desire to marry her.

The situation was further complicated by Ashley Poike’s involvement in an unrelated child sex trafficking case, which led to her incarceration. This, combined with Tran’s mother’s disapproval of the family’s living arrangements, heightened the strain that ultimately culminated in the tragic murders.

According to a courtroom report from local NBC affiliate KSL, Tran shot Smith, a Poike family friend, four times as he sat on a couch. Then he turned the gun on Lyrik who was sleeping in her baby bouncer. Finally, he shot Heike Poike, who had tried to stop him from killing her granddaughter.

Tran reportedly fired some 12 shots, meaning he had to reload the gun at least once during his rampage.

“This was not accidental … This was intentional and knowing,” said prosecutor Morgan Vedejs, per KSL.

Ashley Poike was emotional during her victim impact statement.

“We’re all just suffering still. And it just breaks my heart that my sister Brittany never got to meet my daughter,” she reportedly said. “There are things I think about now, like how my daughter would look … what she would be wearing, if she would act like me. Things like that, that I will never get to know.”

The case was delayed for years because of Tran’s competency issues and other challenges. Tran’s attorneys asked for a sentence of 25 years to life, arguing he may be able to be rehabilitated with the proper counseling and medication.

But 3rd District Judge Elizabeth Hruby-Mills didn’t buy it, saying Tran showed “absolutely no remorse, no responsibility whatsoever.”

“Obviously, [it was] an astounding and staggering crime that occurred here,” she reportedly said.

District Attorney Sim Gill was pleased with the verdict.

“We applaud the judge’s decision that ensures the defendant will spend the rest of his life behind bars. We hope that the victim’s family feels that they have received some measure of justice for the loss of their mother, child, and friend. The three life sentences reflect the level of accountability our community demands when an abhorrent crime like this one is committed in Salt Lake County,” Gill said in a statement.