During the service, which was held on Friday, the pastor read aloud heartfelt letters from the surviving roommates who were in the house at the time of the bloody murder.
The memorial service in Post Falls, Idaho, was organised because “the families have requested that this be a time to bring closure for the community,” according to the Facebook event page.
It was held almost three weeks on from the fateful night which saw University of Idaho students Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20, stabbed to death in their beds.
The three girls lived in the house while Ethan is believed to have been staying over with his girlfriend Xana Kernodle on the fatal night – Sunday, November 13.
The mass murderer remains at large and police are yet to name a suspect or motive but previously suggested it could have been a targeted attack.
They also haven’t identified a murder weapon, though it is reported to have been a KA-BAR-style combat knife.
Officers hadn’t released any names of the surviving roommates but they were publicly identified in the letters read by the pastors.
Dylan Mortensen is believed to be one of the roommates who lived with the three murdered girls.
Ms Mortensen said Xana Kernodle was “the life of the party” but also “strong, intelligent, hardworking and a beautiful person”.
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She described Madison Mogen and Kaylee Goncalves as “the inseparable duo” who were like second mums to her.
She described Ethan Chapin as “like an older brother” to her, whom she said was also “sweet and loving” to his girlfriend, Xana Kernodle.
Ms Mortensen’s letter read: “My life was greatly impacted to have known these four beautiful people. My people who changed my life in so many ways and made me so happy.
“I know it will be hard to not have the four of them in our lives, but I know Xana, Ethan, Maddie and Kaylee would want us to live life and be happy and they would want us to celebrate their lives.”
The second surviving roommate, Bethany Funke, described Ms Gonclaves as one of the funniest people she knew, while also being sweet, giving and determined.
Ms Funke said Chapin had “the brightest most fun personality,” and Kernodle was “loving, fun, energetic, funny, passionate,” and their relationship “made people believe in true love”.
Meanwhile, Ms Funke said she always looked up to Mogen, who gave her the best advice and was always willing to help.
FBI and the police continue to investigate the grisly murders, which have shocked the small university town of Moscow, Idaho, which hadn’t had a recorded murder since 2016.