Speed Freak Killers Timeline

(CBS13) - Wesley Shermantine and Loren Herzog were both convicted in the murder of four people but are believed to be responsible for the deaths of as many as 25 people. Shermantine is on death row. Herzog committed suicide earlier this year.

1984:  Loren Herzog and Wesley Shermantine graduate from Linden High School

1984:  Alleged killing spree begins with the shooting deaths of Paul Cavanaugh and Howard King in Stockton

Oct. 16, 1985:  Chevelle "Chevy" Wheeler goes missing from Stockton. She told friends she was skipping school to go to Valley Springs with a male friend. Authorities later learned that friend was Wesley Shermantine.

Nov. 14, 1998: Cyndi Vanderheiden is raped and murdered in Linden. She was last seen with Shermantine and Herzog. Her body is never recovered.

March 17, 1999: Herzog and Shermantine are arrested for the murders of Vanderheiden and other victims after DNA tests show Vanderheiden's blood was in Shermantine's car.

Feb. 14, 2001:  Shermantine is found guilty of four murders: Cavanagh, King, Vanderheiden and Chevelle Wheeler. Shermantine offers to reveal Vanderheiden's body in exchange for $20,000 for his sons. The family refuses.

March 9, 2001:  Prosecutors offer to take death sentence off the table if Shermantine tells where bodies are buried. He declines offer and is sentenced to death.

Oct. 23, 2001:  Jury finds Herzog guilty of three murders and accessory to fourth. He is later sentenced to 78 years in state prison

Aug. 18, 2004:  Herzog's conviction is thrown out saying investigators coerced him into talking but not about the Vanderheiden case. He accepts plea deal sentencing him to 14 years in prison with credit for time served.

Sept. 18, 2010:  Herzog is released on parole in Lassen County. He lives in a trailer on the grounds of High Desert State Prison in Susanville

Dec. 2011:  Wesley Shermantine again offers to reveal location of dozens of victims for money

Jan. 17, 2012:  Herzog is found dead hanging in his trailer.

Jan. 27, 2012:  Investigators begin digging for remains of the Speed Freak Killers

Feb. 9, 2012:  Human remains found in Calaveras County later identified as Cyndi Vanderheiden through dental records.

Feb. 10, 2012:  Human remains found in Calaveras County believed to be those of Chevy Wheeler.

Feb. 11, 2012:  Remains found in a well described as "bone yard" in Linden.