The State Prosecution informed the Tel Aviv District Court Tuesday of its intention to amend Olga Borisov's charge sheet, accusing the woman of manslaughter, rather than murder, after the Rishon Lezion woman's defense and the prosecution reached a plea bargain. Borisov allegedly drowned her four-year-old son off a Bat Yam beach last August. Borisov was initially charged with murder. During the trial, however, the court found that Borisov was plagued by bouts of depression and was in an unstable mental condition when she killed her son. At the same time, a psychiatric evaluation determined her fit to stand trial. The combination of the expert opinions, deeming Borisov mentally unfit at the time of the crime, yet fit to stand trial, led the prosecution and the defendant's attorney to reach a plea bargain.