Ben Mogen read in court the last thing Maddie wrote to him -- a Father’s Day card: “I hope you have the best day, I can’t wait ‘til we can hang out again soon." ...

"Since Maddie's loss, there's emptiness in our hearts, home and family -- an endless void," he said. Laramie said Mogen's mom suffered from anxiety and depression after her daughter's death ...

Maddie's dad, Ben Mogen, talked about his only child, saying she was the only great thing he ever did and only thing he was ever proud of.

Maddie Mogen, her roommates Kaylee Goncalves and Xana Kernodle, and Kernodle’s boyfriend, Ethan Chapin, were found stabbed to death at the students’ home near the University of Idaho this fall.

Mogen, 21, and three friends, Kaylee Goncalves, 21, Xana Kernodle, 20, and Ethan Chapin, 20, were all stabbed to death during a 4 a.m. home invasion, according to court documents.

"I was prepared to be arrested that day," Alivea Goncalves told ABC News of confronting her younger sister's killer in court.

That's the motto." Maddie Mogen's family also celebrates her birthday with 'Maddie Mae day.' Kaylee loved to travel and had hoped to go to Europe following her graduation from the University of Idaho.

Madison Mogen’s dad still believes the knifeman who slaughtered his daughter and three of her friends likely left a key clue and will get caught.

Mogen’s aunt, Katie Blackshear, and her sister wanted to commemorate Mogen’s joyful spirit on her birthday, May 25, and their friends also wanted to join in. Maddie May Day was born.

Maddie Mogen's dad, Ben Mogen, was choked up in court as he said, "Maddie was my only child. ... I thought we would have the rest of our lives together to be together and know each other, and I ...