SANTA CRUZ, Calif. (KRON) -- Midway through a weeks-long murder trial for a former rock band member, Theobald "Mylo" Lengyel, the Santa Cruz District Attorney's Office received an urgent email. The victim's friend sent an email on September 9 writing, "Hello, I am a friend of Alyx. I wanted to let you know that one night Mylo asked me to help with killing someone. It was 4-5 years ago. I was in shock and terminated the conversation." Lengyel, 55, of El Cerrito, is charged with murdering his girlfriend, Alice "Alyx" Kamakaokalani Herrmann, 61, of Capitola, in December of 2023. The accused killer is a saxophonist and former member of the '90s rock band Mr. Bungle. Alice "Alyx" Kamakaokalani Herrmann (Photo via El Cerrito Police Department) Herrmann's longtime friend read news articles covering the first two weeks of the trial and decided to alert the district attorney with her startling information. The email was shown in court on Tuesday to 12 jurors who will decide Lengyel's fate. The friend, Aida Gray of Palo Alto, testified for hours on Tuesday about the chilling murder plot request and Lengyel's volatile temper. Gray, Herrmann, and Lengyel all worked in the Silicon Valley tech industry for various IT and finance companies. They would sometimes attend parties together, including parties on Gray's 36-foot-long sailboat in the San Francisco Bay. Theobald Brooks Lengyel is seen in a photo released by the El Cerrito Police Department. Herrmann was last seen alive on Dec. 3, 2023 in Santa Cruz. That morning, the ocean-loving Hawaiian native joined her canoe club teammates with Santa Cruz Outriggers for a paddling workout in the harbor. A group of woman wearing "Santa Cruz Outriggers" T-shirts sat in the courtroom gallery this week listening closely to testimony. Herrmann was an employee of Moody’s, a Berkeley-based finance firm, and often worked from home in Capitola, Lookout Santa Cruz reported. Her Apple Watch recorded her final heartbeats on the night of Dec. 4, 2023, Lookout reported. Days later, after Herrmann missed her flight to Hawaii, her family reported her missing to police. Alice "Alyx" Kamakaokalani Herrmann Gray said when she found out that her friend was missing, she immediately suspected that Lengyel was behind the disappearance. Gray called a missing person hotline number, spoke to an El Cerrito Police Department detective, and said, "You need to look at Mylo closely for this." In January of 2024, police found Herrmann’s body hidden in the wilderness of Berkeley’s Tilden Park and officers arrested Lengyel in Santa Cruz County. After police found the body Gray thought, "Wow. He was planning this for a long time," she testified Tuesday. Lengyel has pleaded not guilty to first-degree murder. Theobald Lengyel is arrested by Capitola police officers in Santa Cruz County on Jan. 2, 2024. (Capitola PD photo) Assistant District Attorney Conor McCormick asked Gray to tell the jury about the night that Lengyel allegedly asked for help with a murder plot. Gray said it happened in February of 2019, when she invited Herrmann and Lengyel to her house in Palo Alto. Gray, her husband, Lengyel, and Herrmann were enjoying a bottle of wine together in the living room when the ex-rocker "suddenly asked to go look at my dresses" in Gray's walk-in closet, Gray testified. Gray's dresses are expensive and she is proud of them, so she agreed to show him into her closet, she testified. Gray and Lengyel were alone together looking at the fancy dress when, "out of the blue ... he suddenly asked me if I can help him kill someone. It was a crazy question," Gray testified.  McCormick asked if it appeared like Lengyel was joking, or smiling. "No. He looked me in the eyes. He was intense," Gray answered. Gray immediately left her closet, walked back to her husband and Herrmann in the living room, and reported what Lengyel had just asked, according to testimony. The husband, Brad, began yelling at Lengyel, demanding to know "What the f**k is his problem?"  "We said the party is over, and they left," Gray testified.  Lengyel was a friendly man who displayed sudden bursts of anger, Gray said. Herrmann hosted a Polaroid picture-themed house party in the Richmond hills on March 30, 2019 and photographs from the party were shown in court. "This is the first trial I've had where a Polaroid was used as evidence," McCormick said, spurring chuckles from jurors. At the party, Lengyel played a rock jam session while Herrmann and Gray chatted together in the kitchen. Lengyel confronted the two women in the kitchen because he was angry that they were not listening to his music, Gray testified. "Mylo was very angry that we could care less about the music. He lost it and started yelling at us," she told the jury. During the trial's opening statements on September 4, McCormick described Lengyel as an alcoholic with fits of rage, Lookout reported. Gray said she decided to testify because, based off news articles she read about the trial, the jury was not hearing the full story about the victim's boyfriend. Friends in Santa Cruz convinced Gray that testifying was the right thing to do, she told jurors. On Tuesday, one of Herrmann's Outrigger Santa Cruz teammates testified that on the day before the victim disappeared, Herrmann said she was thinking of selling her Capitola beach house and moving in with Lengyel. The teammate said she was shocked because Herrmann had always planned to give the house to her daughter. Testimony suggested that Herrmann did not have control over big life decisions while she was in a relationship with Lengyel.  New witnesses will be called to the stand as testimony continues on Wednesday. Santa Cruz County Superior Court Judge Nancy de la Pena is presiding over the trial.