Peruvian prosecutors have charged Joran van der Sloot with first-degree murder in last year's killed of a university student the defendant met at a Lima casino.

They are seeking a 30-year jail sentence.

Before the killing of 21-year-old Stephany Flores on May 30, 2010, van der Sloot was widely known as the prime suspect in the unresolved 2005 disappearance of the American teenager Natalee Holloway in Aruba, The Daily Mail reported.

Flores' lawyer, Edward Alvarez, told the El Comerico newspaper in Peru that prosecutors have had all the evidence they need to proceed, but have done nothing.

It's just irresponsible, Alvarez told the newspaper Newscore, and talking primarily of senior prosecutor Miriam Riveros Castellares. She's amassed all the files and is not taking into account the time. This case seems to matter very little to her.

Van der Sloot, the son of a wealthy Dutch judge, admitted to murdering Flores, but has pleaded violent emotion which is typically the term used in Peru to describe crimes of passion.

Currently, he is being held at Miguel Castro Castro Jail in Peru, where it is said that he recently got his girlfriend pregnant during a conjugal visit. It is believed to be a girl that worked at the casino in which Stafany Flores was in the night van der Sloot allegedly murdered her by strangling and suffocating her.

Van der Sloot has repeatedly confessed and then recanted playing a role in the disappearance of Holloway, an 18-year-old Alabama student who was visiting Aruba in 2005 on a high school graduation trip with classmates.