Solved Cold Cases

OPD Case 80-14343

In 1980, 15-year old Stacy Knappenberger was raped and killed in her home. In 2012, Oxnard police detectives and the Ventura County Cold Case Task Force identified Thomas Young for these crimes. The use of DNA analysis assisted in this investigation. Young was arrested at his home in Alabama. Young has since been convicted of all charges and was sentenced to life in prison without the possibility of parole.

OPD Case 82-07899

In 1982, Donald Robertson was killed in the 1300 block of Commercial Avenue during an alcohol fueled argument. In 2013 Oxnard police detectives conclusively determined that Ernest Berryman was responsible for this murder. Unfortunately, Berryman was found to be deceased.

OPD Case 05-30337

In 2005, Joaquin Castaneda was found shot to death in the 900 block of Richmond Avenue. In 2016, Oxnard police detectives gathered sufficient evidence to arrest Isaac Sinsun for Castaneda's murder. Sinsun was convicted of first degree murder and was sentenced to 25 years to life in prison.

OPD Case 82-02954

In 1982, a female victim was kidnapped, robbed, and raped. DNA analysis was used to identify Delton Taylor as the suspect in this case. An arrest warrant was issued for Taylor and he was arrested in Bakersfield. In 2015, Taylor was convicted of kidnapping with intent to commit robbery. The rape charge could not be prosecuted due to statute of limitations. Taylor was sentenced to 7 years to life in prison.

OPD Case 85-18012

In 1985, Isabel Hernandez was found stabbed to death in an apartment in the 900 block of West Gonzales Road. Hernandez worked at a credit card company and was active in her church. Hernandez was staying at her boyfriend's Oxnard apartment for the weekend when she was killed. Her boyfriend was at a Bruce Springsteen concert in Los Angeles and his roommate was out of town, so she was alone in the apartment. Her boyfriend came home about 1:15 a.m. on Sept. 28, 1985, and found her dead from multiple stab wounds. In 2016, DNA was instrumental in identifying Vincent Mackey as being responsible for Hernandez' murder. Mackey was already in prison serving a life sentence for murder. Ultimately, Mackey pled no contest to the charge of Hernandez' murder. Mackey was ultimately sentenced to life without the possibility of parole.

OPD Case 03-15832

In 2003, Brian Brown was shot and killed in the 4200 block of Terrace Avenue. In 2015, Oxnard police detectives gathered enough evidence to charge David Acosta with Brown's murder. Acosta was serving a prison sentence when he was arrested. Acosta pled guilty to manslaughter with a firearm. He was sentenced to 33 years in prison.

OPD Cold Case 79-10172

In 1979, Ruben Martinez was shot and killed while seated in a parked car in the 100 block of North Rose Avenue. In 2017, Oxnard police detectives re-interviewed several eyewitnesses in this case. Detectives were able to conclusively prove that Robert Amaro was responsible for this murder. Amaro was found to be deceased.

OPD Case 79-13967

In 1979, Ladislado Gonzales was shot and killed in the 2000 block of San Jacinto Street. In 2013, Oxnard police detectives re-interviewed several eyewitnesses in this case. Detectives were able to conclusively prove that Robert Amaro was responsible for this murder. Amaro was found to be deceased. This was the second murder associated with Amaro in 1979.

OPD Case 96-18337

In 1996, Manual Amaro was found shot to death in the 1500 block of Morris Street. In 2013, Oxnard police detectives obtained sufficient evidence to prove that Ralph Lopez was responsible for Amaro's death. Investigators learned that Lopez was murdered in 2003.