Survivor evidence · two capital cases · a later DNA link
Survivor evidence and separate prosecutions established the principal trail attacks, while a later DNA match extended David Carpenter's documented sequence back to 1979.
The Trailside Killer case tracks the Northern California attacks attributed to David Carpenter, who targeted hikers and isolated trail users from 1979 through 1981 across Mount Tamalpais, Point Reyes, Henry Cowell Redwoods, Big Basin, and San Francisco's Lands End. Prosecutors secured separate capital judgments in the Santa Cruz and Marin County branches of the case, with the California Supreme Court affirming those records in 1997 and 1999 after years of litigation. In 2010, DNA evidence publicly linked Carpenter to the earlier murder of Mary Frances Bennett, strengthening the view that the famous trail killings were part of a broader pattern that began before the Bay Area panic of late 1980.
The survivor account
A description helped focus the investigation
Recent developments
Recent reporting and official developments, labeled by source and verification status.
Apr 8, 2026 · ABC News
ABC News announced Terror on the Trails, a documentary featuring survivor Lois DeAndrade, relatives of victims, defense attorney Jay Ruskin, and witness Karen Kilroy in a reconstruction of the investigation and its human impact.
View official release →The scale
Key figures are drawn from the published case record.
The evidentiary arc
Witness evidence helped end the active attacks, separate prosecutions established the core cases, and later DNA pushed the known sequence back to 1979.
See all 8 mapped locations →Aug 1, 1979
Mary Frances Bennett was found slain in San Francisco's Lands End area in August 1979. The killing was not publicly tied to Carpenter until DNA evidence was announced decades later.
Mar 8, 1980
Barbara Schwartz survived an attack on Mount Tamalpais and gave police a description that helped generate the well-known suspect sketch.
Mar 29, 1981
Carpenter attacked Ellen Hansen and Steven Haertle in Henry Cowell Redwoods State Park, killing Hansen and wounding Haertle, who survived to become a key witness.
May 14, 1981
A task force arrested Carpenter at his San Francisco home on May 14, 1981, ending the active phase of the Northern California trail killings.
May 10, 1988
In a venue-shifted trial held in San Diego, Carpenter was convicted of the Marin County murders that had driven the Bay Area's Trailside panic.
Feb 23, 2010
San Francisco authorities announced that DNA evidence tied Carpenter to Mary Frances Bennett's 1979 killing, expanding the accepted arc of the case backward before the public Trailside label had even formed.
How the case closed
Survivors supplied descriptions and testimony that helped investigators identify and prosecute David Carpenter.
Separate Santa Cruz and Marin proceedings produced convictions and capital judgments for distinct groups of attacks.
DNA later connected Carpenter to Mary Frances Bennett, extending the documented pattern to an earlier San Francisco homicide.
The attacks crossed five major park areas, turning trails and recreation corridors into a defining part of the case.
See the locations and case imagery →Where certainty changes
Open each layer to see what the archive treats as core, contested, or unresolved.
Go deeper
This overview is the map. The case tabs hold the underlying events, people, media, locations, and source material.