A Somerville woman accused of stabbing her boyfriend to death late last year remains held without bail as the district attorney's office continues to prepare its prosecution.

Kimberly Savini allegedly stabbed boyfriend Arnaldo Amado during a domestic dispute on Dec. 27, 2008. She has remained in custody since on a first-degree murder charge.

According to police reports from the incident, after calling 911 Savini initially said Amado had been attacked outside of the couple's home at 11 Greenville St. but later admitted to stabbing him during an argument in self defense.

At an Oct. 2 bail hearing at Woburn Superior Court, Savini was again denied bail and ordered to undergo DNA testing, according to a District Attorney spokesperson. An evidentiary suppression hearing has been set for Oct. 22.

The mandatory sentence for a first-degree murder conviction is life in prison without eligibility for parole.