A friend and classmate of 20-year-old Erin Edwards, who died last week in an apparent double murder-suicide, has spoken out on the victim's relationship with her mother, the primary suspect in her slaying.

Boston University student Sofia Colombo-Abdullah expressed shock following news that Erin and her brother, 24-year-old Christopher Edwards Jr., had allegedly been shot and killed by their mother, 58-year-old Marsha Edwards, before she turned the gun on herself in the family's Georgia townhouse.

"Erin and her mom were best friends," Colombo-Abdullah told the Boston Globe. "We don't understand what happened, but Erin loved her mom and her whole family."

The student, who said she befriended Erin in a sociology class last year, also took to Instagram to share a tribute to the young victim, writing that she remembered "wanting to be your friend before I ever even met you" and that she was "glad" she got that chance.

Colombo-Abdullah is not the only person baffled by the case, which left multiple communities reeling as they attempted to figure out how such an unthinkable tragedy could befall the seemingly tight-knit family.

Neighbor Talia Cartall told WSB-TV the crime has made "a huge impact on everyone in the neighborhood."

"For something like this to happen and unfold, it's unbelievable," she told the station. "We didn't hear anything. There was no sign of violence or anything."

"From our knowledge, no malice between the children, nothing like that. They just seemed like a normal, happy, cool family," she added.

Confusion surrounding the case may be partially explained by a glance at the victims' or the suspect's social media profiles, all of which seem to reveal a loving family that travels and celebrates milestones together.

In June, Marsha Edwards shared a picture of herself posing with her two children to celebrate their birthdays, Erin's on June 21 and Christopher's on June 30.

"Sending birthday wishes to my June Blessings," she wrote at the time. "Happy Birthday to you both. #mybestguy #mybestgirl."

On Wednesday, the same day Marsha, Erin and Christopher's bodies were discovered by police officers conducting a welfare check, the suspect had taken to Instagram to gush about the two victims.

"I've had the best summer, first with Chis [sic] in Miami, and Erin in Italy," she wrote. "I could not ask for better children."

The two social media posts are just a sample of the lengthy and confusing digital paper trail left behind by the family.

20 PHOTOS Marsha Edwards and her two children, Erin and Christopher, dead in apparent murder-suicide See Gallery Marsha Edwards and her two children, Erin and Christopher, dead in apparent murder-suicide Too cool for school... kinda 😎👨🏽‍🎓🎉 #classof2018 #proudsister Birthday dinner at Aurora in Soho. 🎈🎂 Dinner with my Erin in Italy.🍷🥰 Happy 4th Of July!⛱ Florence, Italy. Sending birthday wishes to my June Blessings. #mybestguy #mybestgirl Can’t go to NY without seeing my cousin Kevin and a Broadway Performance.....wonderful by the way. #itsabouttheexperience Who let me in here tbh? 👀@nbcu_interns @nbcnewyork #internatnbcu #stillshook I’ve had the best summer, first with Chis in Miami, and Erin in Italy. I could not ask for better children. ❤️🍷😎 NABJ 2019 My mother and Chris.❤️ Erin graduated Magna Cum Laude, AJC recipient, and Posse Scholar 2017. She has interned at CNN, City of Atlanta Communications Division, and now NBC in NY. A very kind, yet driven soul. Look out Hoda and Jenna. #keepyoureyeonthisone Oh Sun, is that you? 🌞 Celebrating 19 years of failed assassin attempts... probably 🤷🏽‍♀️👀 #19 Ciao, Italia 🇮🇹 And that’s a wrap on an amazing summer with @nbcnewyork ! 💙 Thank you thank you THANK YOU to @nbcu_interns for this incredible opportunity. Thank you to my amazing team for believing in me, rooting for me, and pushing me to be my best every single day. And thank you to all the people who shared their stories with me this summer. You’ve moved me, inspired me, and challenged me in ways I could have never expected, and I’m a better journalist and person for it. See you later, @nbcuniversal 👋🏽 #internatnbcu #hereyoucan Cruise along the famous and spectacular Lake Como. #Italytravel Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

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