A former rock musician was arrested and charged with murder in the death of his girlfriend after a body was found in a wooded area of a California park. 

Theobald "Theo" Lengyel, 54, was arrested and charged with first-degree murder on Tuesday in the death of 61-year-old Alice "Alyx" Kamakaokalani Herrmann.

Capitola Police said Lengyel also goes by the name "Mylo Stone." He is a former saxophone player and founding member of the band Mr. Bungle, according to local station KTVU. 

Herrmann was last seen on December 3 in Santa Cruz, California. She was a member of Outrigger Santa Cruz, a competitive canoe paddling group. The group said she was present at practice on December 3, according to a post on the group's Facebook page.

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Split image of Theobald "Theo" Lengyel and his girlfriend Alice "Alyx" Kamakaokalani Herrmann

Theobald "Theo" Lengyel (L), 54, was arrested Tuesday, January 2, 2024, and charged with first-degree murder in the death of his girlfriend, Alice "Alyx" Kamakaokalani Herrmann (R), 61. (Capitola Police Department/Facebook and KTVU)

Herrmann's family reported her missing on December 12, after not hearing from her for over a week. 

El Cerrito Police found her car in front of Lengyel's home. 

Alice "Alyx" Kamakaokalani Herrmann wearing sunglasses

Herrmann was reported missing by her family on December 12, after they had not heard from her in over a week, police said. (EL CERRITO POLICE DEPARTMENT)

Police immediately named Lengyel a person of interest in Herrmann's disappearance, saying he refused to cooperate with the investigation.

"As the investigation progressed, it became clear that foul play was involved, leading to the identification of Theobald Lengyel as a suspect," the Capitola Police Department said in a press release.

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Capitola Police said human remains were found in a wooded area within Tilden Regional Park in Berkeley. Official identification of the remains is still pending DNA confirmation from the coroner's office, police said.

Theobald (Theo) Brooks Lengyel smiling in a photo

Theobald Lengyel, also known as Mylo Stone, was the saxophonist for an '80s rock band called Mr. Bungle.  (KTVU)

Police have not said how Herrmann died.

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Lengyel was apprehended by the Santa Cruz County Sheriff’s Office without incident and booked into the Santa Cruz County Jail.

Lengyel was being held without bail, according to online jail records reviewed by Fox News Digital.

"The diligent work of our investigators, in coordination with our law enforcement partners, has led to the apprehension of Theobald Lengyel in connection with the tragic homicide of Alice Kamakaokalani," the Capitola Police Department said in a press release. "We extend our deepest condolences to the family and friends of the victim during this time."

Herrmann was a neuroscientist who had a degree from Caltech, according to KTVU.