A former rock musician has been arrested on a first-degree murder charge in the death of his missing girlfriend after human remains were found in a wooded area in California, police said.

Theobald “Theo” Lengyel, 54, was taken into custody Tuesday in connection with the homicide of his girlfriend Alice “Alyx” Kamakaokalani Herrmann, 61, who was last seen Dec. 3 in Santa Cruz, Capitola police announced Tuesday.

She was reported missing by her family on Dec. 12, the El Cerrito Police Department said.