A convicted serial killer already serving time for multiple murders has now received another life sentence after DNA evidence solved a brutal killing that remained a mystery for more than three decades.
Authorities say modern forensic technology finally connected the inmate to the 1992 murder of an elderly California man whose death shocked investigators and left a family waiting years for justice.
Serial Killer Joseph Foster Sentenced in 34-Year-Old Cold Case Murder
A convicted serial killer has been sentenced to an additional 75 years to life in prison for the 1992 murder of an 85-year-old man in California.
Authorities confirmed that 65-year-old Joseph Foster received the new sentence on April 30 in Placer County.
Foster was sentenced for the murder of Alwin Schoefer, whose killing remained unsolved for 34 years.
The Placer County Sheriff’s Office said the breakthrough finally brought justice to a case that had gone cold for decades.
Elderly Victim Found Dead Inside Burning Home
The investigation began on August 6, 1992, when emergency responders arrived at a house fire.
When police reached the property, they made a disturbing discovery.
Investigators found:
- The home had been padlocked shut
- Smoke and fire damage throughout the property
- The victim dead inside the home
Authorities later identified the victim as 85-year-old Alwin Schoefer.
According to investigators, Schoefer had suffered:
- Multiple stab wounds
- A gunshot wound
Police later determined he had been murdered before the fire started.
Investigators Say Fire Was Set to Destroy Evidence
After examining the crime scene, detectives concluded that the fire had been intentionally set.
Investigators believed the suspect may have started the fire to:
- Destroy evidence
- Delay identification
- Hide the murder
Authorities also suspected robbery could have been the motive.
According to investigators, Schoefer was known to keep large amounts of cash at home instead of using a bank.
This made him a possible target.
Cold Case Remained Unsolved for More Than Three Decades
Despite collecting evidence at the scene in 1992, investigators were unable to identify a suspect.
The case eventually went cold.
For 34 years, detectives continued holding onto evidence while waiting for advancements in forensic science.
That breakthrough finally came through modern DNA testing.
DNA Technology Linked Joseph Foster to the Murder
Authorities say improvements in DNA technology eventually connected Joseph Foster to Schoefer’s killing.
After the evidence was reexamined, investigators identified Foster as the suspect.
Faced with the forensic evidence, Foster pleaded guilty to murder on March 30, 2025.
This guilty plea officially closed one of the county’s oldest unsolved homicide cases.
Foster Was Already Serving Time for Multiple Murders
At the time of this latest conviction, Foster was already serving prison sentences for several violent crimes.
His criminal history includes:
| Year | Crime |
|---|---|
| 1980 | Convicted of involuntary manslaughter in a fatal shooting |
| 1991 | Murder of a man |
| 1991 | Murder of a woman |
| 1992 | Murder of Alwin Schoefer |
Authorities say the 1991 murders were also solved years later through DNA evidence in 2017.
Investigators now describe Foster as a serial killer responsible for multiple deaths spanning more than a decade.
Sheriff Says Cold Case Work Continues
Following the sentencing, Placer County Sheriff Wayne Woo praised investigators for their persistence.
He said cases like this strengthen law enforcement’s commitment to solving unsolved murders and bringing justice to victims and families, no matter how much time has passed.
Justice Finally Served After 34 Years
The sentencing of Joseph Foster marks the end of a heartbreaking case that remained unsolved for more than three decades. While nothing can undo the brutal death of Alwin Schoefer, modern DNA science has once again proven its power in solving cold cases that once seemed impossible to crack. For investigators, victims’ families, and the community, the case serves as a reminder that justice may be delayed, but it is never forgotten.
