Vanessa Guillen’s fiance, closest friends detail upsetting investigation

In the last year, her name has become a rallying cry for military reform. Her family is still looking for answers as to why she was killed.

Vanessa Guillen will forever be 20 years old, engaged but will never be married. She was murdered, inside one of the Army’s largest military installations. Later, the world learned that she had told her mother she was sexually harassed on the base. In the last year, her name has become a rallying cry for women’s safety and military reform. Her family is still looking for answers as to why she was killed, and how her murderer escaped justice. Watch the full story on "20/20" TONIGHT at 9 p.m. ET on ABC. Born and raised in Houston to immigrants from Mexico, Guillen was one of six children. Guillen’s family says she had dreamed of serving her country in the military since she was a child. She attended her first Army training in June 2018 and was later stationed at Fort Hood, Texas, making the three hour drive back to Houston every weekend to see her family.