Brother pays tribute to his 'beautiful' sister, 20, who was allegedly stabbed to death by her father

The little brother of a 20-year-old medical student allegedly stabbed to death by her father has spoken about his "beautiful big sister" at the Adelaide woman's funeral.

Sabrina Lekaj was found outside the family's Kidman Park home in her Mercedes Benz after a night of clubbing, next to her father Petrit Lekaj, 49. Both were suffering from multiple stab wounds, and Sabrina died shortly after police arrived at the scene. 

Her father, who reportedly remains under police guard at the Royal Adelaide Hospital, was later charged with the murder of his daughter.

It is understood that Petrit Lekaj allegedly stabbed his daughter before turning the knife on himself.

Lekaj's 11-year-old brother Pyrrhus and mother Romina spoke at the funeral on Wednesday, reflecting on positive memories with a woman who has been described as highly intelligent, talented and outgoing.

Pyrrhus described his sister as "very smart and always influenced me to become more than what I am," the Daily Mail reports.

He said Sabrina's last words to him was that she loves him, and will see him later.

"My sister was very loving and caring, we always went everywhere together," Pyrrhus said.

The tragic circumstances were not mentioned at the funeral service, as her mother urged the mourners to "focus on the good times".

"My darling daughter, you have not left us - you will always be here with us. You were so beautiful, so smart and you touched so many lives," Romina Lekaj said in a heartbreaking eulogy.

The 20-year-old was studying medical imaging and classical piano performance at the University of South Australia. She graduated high school with an ATAR score (Australian Tertiary Admission Rank) of 99.35.

It has been reported that Sabrina Lekaj had a difficult, often volatile relationship with her parents.

It is understood the family immigrated from Albania.