The Prosecutor's probe in the brutal murder of a young woman in Bulgaria's Black Sea capital Varna has been incompetent and sloppy, according to attorney Todor Kasabov.

Kasabov is one of the members of the defense team of Georgi Tsvetanov, the young man charged with the savage murder of the third-year Varna college student, Radostina Eftimova.

Kasabov was adamant that a third person, present at the crime scene at the night of the murder, has also been involved in Radostina's killing.

The attorney said that there were traces of three blood types in the apartment, a stark proof that a third person was there, adding the investigation failed to even test and establish his client's blood type.

The other lawyer, Dimitar Dimitrov, pointed out that there wasn't any evidence Radostina's boyfriend, Petar, was in London in the night of the murder as the Prosecutor claims.

Both explained Georgi has insisted before them the girl was killed by a third person and that he was attacked by him, fought and then became unconscious and does not remember anything of what happened next.

The mutilated body of the third-year student from Varna's Business University was discovered by her sister on March 7 with over 50 knife wounds. The murder sent shock waves across the country and triggered mass student protests.

Despite mounting evidence, Georgi Tsvetanov, who faces life in prison, refuses to collaborate with the authorities, and continues to deny any involvement in the murder.

Georgi is the son of a prominent Varna politician, Tsanko Tsvetanov, Deputy Chair of the Union of Democratic Forces (UDF) and Chair of the UDF branch in the Bulgarian Black Sea capital Varna, who was forced to resign over the murder scandal.