Derek Jensen ambushed his ex-girlfriend and her friends on a dark Alberta highway in December 2011, unleashing a deadly shooting spree before turning the gun on himself.
Derek Jensen
Derek Jensen | Mass Murderer
Crime Spree: December 17, 2011
- Full Name: Derek Jensen
- Age at Time of Incident: 21
- Date of Incident: December 15, 2011
- Location: Highway 2, near Claresholm, Alberta, Canada
- Type of Crime: Murder–suicide, mass shooting
- Fatalities (excluding perpetrator): 3
- Total Fatalities (including perpetrator): 4
- Injuries (survivors): 1
- Weapon Used: Heckler & Koch P30L 9 mm handgun
- Other Weapons Found: Shotgun and rifle in his vehicle; more firearms and ammunition at his home
- Method / Modus Operandi: Followed victims, rear-ended their car, then opened fire; afterward shot himself
- Victims:
- Tabitha Stepple (ex-girlfriend, killed)
- Mitch MacLean (friend, killed)
- Tanner Craswell (friend, killed)
- Shayna Conway (friend, survived with serious injuries)
- Status: Deceased – suicide at the scene
Classification & Characteristics
Derek Jensen is best classified as an intimate-partner mass murderer whose violence stemmed from personal grievance rather than ideology. His actions fit the profile of a targeted murder–suicide driven by jealousy, rejection, and escalating emotional turmoil. The attack was not impulsive alone; Jensen prepared by following his victims, rear-ending their vehicle to trap them, and opening fire with a handgun while carrying additional firearms in his vehicle.
His behavior shows traits of planning and control, hallmarks of an organized offender, yet the emotional fuel behind the crime reveals strong elements of desperation and obsession. By focusing his violence on his ex-girlfriend and her companions, Jensen displayed the classic characteristics of a relational predator who externalized blame for his own loss of control. The choice to end his life immediately after the murders further aligns with the murder-suicide pattern common in domestic and intimate-partner violence, underscoring the blend of revenge, possessiveness, and self-destruction at the heart of the crime.
Derek Jensen | Mass Murderer
Jilted Lover
On Saturday, December 17, 2011, Derek Jensen made four fatal mistakes.
Moments before four young people were shot dead in Alberta, one car rear-ended another forcing it to stop it on a highway near Lethbridge.
The Mounties said the car that rammed the other was being driven by 21 year old Derek Jensen. He had been looking for his ex-girlfriend since early Thursday, after a confrontation at a pub.
Derek Jensen had been following her car, after spotting it at a 7-Eleven convenience store in Claresholm. Jensen had three loaded and registered guns with him: a handgun, a shotgun and a rifle.
When the driver, Shayna Conway, 21, got out of the damaged car, she was immediately shot several times with a handgun.
Conway, who survived her wounds, was instrumental in piecing together the incident.
Murder-Suicide
The RCMP said Jensen then approached the car and fired several shots, killing his ex-girlfriend Tabitha Stepple, 21, and Tanner Craswell, 22. Mitchell MacLean, 20, who was also shot. He escaped from the car and crawled into a ditch to get away from the shooter. He died on the way to hospital.
Derek Jensen then shot himself and died.
Derek Jensen
RCMP Sgt. Patrick Webb said investigators are examining “a domestic violence, jilted-boyfriend motive” in the slayings.
“We can surmise there was definitely a certain amount of planning in this,” Webb told a news conference in nearby High River. “No one drives around for the most part with three loaded weapons. Exactly how they were to be utilized or what his intentions were, we may never know.”
Witnesses told CTV News that Stepple’s former boyfriend, Derek Jensen, went “berserk” when he found Stepple and the other three celebrating Craswell’s birthday in a Lethbridge pub on Wednesday night.
“He saw her and lost it, lost his mind,” said Caitlin McFarland, a friend of Stepple’s. “Then, when we left, he was phoning her, phoning her, phoning her and said to her, ‘This night’s not going to end well for you. I hope you know that.'”
McFarland said Derek Jensen pushed Stepple out of her chair during the confrontation at the pub. The couple broke up a few months earlier but were still living together, although Jensen was supposed to have moved out the day of the shooting.
Early Thursday morning, the bodies were discovered on the side of Highway 2 north of Lethbridge. Friends said Stepple and Conway were taking the two men to the Calgary airport for a flight back home to Prince Edward Island for Christmas.
According to the couple’s friends, Jensen, an avid hunter and skeet shooter who had recently completed training as a paramedic, was a nice boy from a good Mormon family but a possessive and jealous boyfriend.
In the end, that night ended well for no one, including Derek Jensen.
source: murderpedia
📚 Additional Resources
- Global News — “RCMP give detailed account of deadly highway shooting”
- A detailed investigative summary from the RCMP, including weapon recovery, sequence of events, and victim status.
- Read it Global News
- Global News — “Family shares sole survivor’s account of highway shootings”
- Focuses on Shayna Conway’s eyewitness account and what she recalled from the shooting.
- Read it Global News
- Bell Media / W5 — “Road to Murder” documentary background
- W5’s investigation into the shooting, including interviews with Conway, families, and police, plus text message evidence.
- Details Bell Media
RCMP & Official Accounts / Investigative Reporting
- Global News — “RCMP give detailed account of deadly highway shooting” (weapon details, sequence, autopsy, motive)
- Global News — “Timeline: Claresholm, Alberta highway murder-suicide” (event timeline, context) Global News
- Calgary CityNews — “New details surface in Triple Murder-Suicide” (pre-shooting behavior, threats, pursuit) CityNews Calgary
Autopsy / Forensic / Postmortem Reports
- High River Online — “Claresholm Autopsies Completed” (causes of death established via gunshot, confirmation of multiple firearms) High River Online
Media Archives / Retrospectives
- Winnipeg Free Press — “’Night’s not going to end well,’ killer told ex” (report on Jensen’s threats before the shooting) Winnipeg Free Press
- Murderpedia — Derek Jensen profile (classification, victim list, method) Murderpedia
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This page is part of the WickedWe True Crime Archive – a resource for researchers, students, and true crime enthusiasts seeking verified facts, case records, and deeper historical context.
- Wikipedia – Claresholm highway shooting (overview + timeline) Wikipedia
- Murderpedia – Derek Jensen profile (classification, victims, method) Murderpedia+1
- Global News – Timeline: Claresholm, Alberta highway murder-suicide (detailed chronology and context) Global News
- Global News – “Shooter armed with guns, following ex-girlfriend’s car…” (police account, weapons, lead-up) Global News
- Global News – “RCMP give detailed account of deadly highway shooting” (official details, weapons, motive) Global News
- CityNews / Calgary – “New details surface in Triple Murder-Suicide” (local reportage, prelude) CityNews Calgary
- Winnipeg Free Press – “‘Night’s not going to end well,’ killer told ex” (details of the confrontation, threats) Winnipeg Free Press
- Vancouver CityNews – “Man followed former girlfriend’s car before shooting” (report on his following, firearms, shooting sequence) CityNews Vancouver
