A male friend of the family, suspected of raping and strangling the girl, remains in detention after being arrested for questioning last Saturday, according to a statement issued this week by cantonal justice authorities.
The man, who has reportedly denied the allegations, is a friend of Semhar’s mother, Le Matin newspaper earlier reported.
Authorities said DNA samples have not been identified and lab results would not be known until next week.
Semhar’s dead body was found last Friday evening by a police dog under a bed during a search of her family’s apartment in Carouge, a municipality in the canton of Geneva.
The discovery was made an hour after police issued a bulletin seeking help from the public to find the girl who had been reported missing since last Thursday evening.
The 12-year-old, of Ethiopian origin, was last seen at a crosswalk near her home after walking with a group of friends from the Drize school in Carouge.
According to news reports, the girl’s two-year-old brother and 14-year-old sister slept on the bed above their sister’s body.
Semhar’s parents separated in May this year.