San Diego ? A judge ordered a new trial Friday for a woman who was convicted of poisoning her Marine husband with arsenic and using the life insurance to pay for breast implants.

San Diego Superior Court Judge Peter Deddeh found that Cynthia Sommer, 34, received ineffective representation from her former defense attorney.

Deddeh said the attorney’s errors allowed prosecutors to introduce evidence about Sommer’s wild partying immediately after her husband’s death.

Sommer’s former attorney, Robert Udell, told the judge that he committed tactical errors, including failing to call witnesses to adequately refute prosecutors’ theories about the source of the arsenic.

Udell did not respond immediately to a telephone message after the ruling.

A jury convicted Sommer in January of first-degree murder by poisoning and for financial gain. She faced a mandatory sentence of life in prison without the possibility of parole if Deddeh had denied the retrial.