Before Farrah Abraham was the Teen Mom OG star we know today, she was just a normal high schooler in a normal high school relationship with Derek Underwood. Sadly, shortly after learning she was pregnant, Derek suddenly passed away in a car crash.

On Dec. 28, 2008, Sophia Abraham’s dad lost control of his car while driving in Iowa. The car skidded and flipped over, killing Derek and another passenger. Both boys were 18-years-old at the time of their deaths.

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While Farrah has sadly had to live without her daughter's father for as long as her daughter has been around, it’s clear that it’s a top priority to keep Derek’s memory alive. Just a couple of months ago, on the anniversary of his death, Farrah shared a personal message with her fans.

“In loving memory of Daddy Derek 12/28/2008 we love and miss you and we wanted to share this video with others who lost a loved one around the holidays,” she captioned the video. “Much love, strength, and success in 2017 we're so excited to continue our journey God has blessed us with.”

We’ve also gotten to see an inside look of Sophia’s struggle with losing her father. On an episode of Teen Mom OG, the mother-daughter duo was on its way to visit with Derek’s family when Sophia began to say some upsetting things on their way to the cemetery.

“I want a daddy! I want a daddy now! Daddy! Daddy, daddy, daddy, daddy! I want to die," she yelled.

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Farrah quickly responded tearfully and explained, "When you say you want to die to see him, it really makes mommy sad. Do you know that it hurts mommy when you say those things because I care about you, and I love you?"

Even though “Daddy Derek” has been gone for almost a decade, it’s clear he’s still a big part of his daughter’s life!

Scroll through the gallery below for rarely-seen pics of Farrah and Derek!