DA O’Malley Announces Felony Charges Against Livermore Man in 1997 Cold Case Sexual Assaults

Alameda County District Attorney Nancy E. O’Malley has announced that her office has filed multiple felony sexual assault charges against Livermore resident Gregory Paul Vien, based on crimes committed against two women in 1997 in the cities of Livermore and Union City, CA.

On May 6, 1997, the defendant attacked a woman as she walked to BART after work. He dragged her to a secluded area where he sexually assaulted her. Union City Police detectives were able to obtain a sample of the suspect’s DNA from the victim’s clothing. On September 7, 1997, the defendant attacked a second victim while she was on a walk near Livermore High School in the city of Livermore. The defendant sexually assaulted the victim, and the Livermore Police Department was able to collect a DNA sample from the crime scene.

The DNA samples from both crime scenes were analyzed in a timely manner, and found to be a match to each other, meaning that law enforcement knew that the same person was responsible for both assaults. The samples were uploaded to CODIS, the national DNA database. However, no “hit” was made to determine the identity of the assailant.

In 2019, detectives from the Livermore Police department developed additional leads through a genetic genealogical search in their quest to solve these 22-year old sexual assault crimes. Those leads enabled additional investigation with a focus on Mr. Vien and the eventual collection of Mr. Vien’s DNA sample, ultimately identifying him as the assailant in both crimes.

“For over 20 years, the survivors of these sexual assaults have lived with the constant uncertainty that comes with not knowing when, if ever, their assailant will be identified and brought to justice,” states DA O’Malley. “The police agencies never gave up, nor let these investigations go cold. Their dedication, tenacity and excellent investigative work, has now paid off in the arrest of Mr. Vien. My office’s specialized cold case unit and sexual assault unit worked alongside our law enforcement partners and will now ensure that Mr. Vien is held to account for the crimes he committed.”

The defendant was arraigned on November 7, 2019. His next court date is set for November 20, 2019 at the East County Hall of Justice in Dublin, CA.

Please find the criminal complaint as well as the declaration of probable cause here.

Anyone who believes he or she has additional information is asked to contact Sgt. Steve Goard of the Livermore Police Department at 925.580.9585 or at sgoard@cityoflivermore.net

Posted on Nov 18, 2019