# Sean Tiessen manslaughter trial testimony concludes > Live situation record from CLSTR: https://clstr.news/situations/sean-tiessen-manslaughter-trial > Updated: 2026-08-21T18:35:00.000Z. Sources: 54. Developments: 3. The manslaughter trial of 47-year-old Sean Tiessen has concluded testimony in the Rossland Supreme Court. Tiessen is accused of the April 2023 death of 33-year-old Joshua Lockwood in rural Grand Forks. Tiessen has entered a plea of self-defence, claiming Lockwood threatened him with an axe during a dispute involving a puppy. Crown prosecutor Bryan Pankoff argues the force used was not justified. During the proceedings, Lockwood’s girlfriend, Keara Roberts, testified that a verbal argument preceded the shooting and noted that Lockwood died from a gunshot wound to the chest. In his testimony, Tiessen explained that he sought roommates via Facebook to monitor his property following an SPCA complaint. He stated that Lockwood and Roberts moved in on March 20, 2023, but described the arrangement as a mistake due to noise and rent collection issues. While Tiessen acknowledged awareness of police presence at the residence prior to the incident, he testified he was initially unaware of any drug use by his roommates. Audio recordings from the night of the incident captured Tiessen telling 911 operators to “get out of my home” while Roberts could be heard crying in the background. Tiessen also testified to a history of “repeated domestic disturbances” between Lockwood and Roberts at the residence. ## Claims - Sgt. David Mackey testified that his role as crime scene manager was to collect evidence for the investigation. (corroborated by 13 sources) - Sean Tiessen is facing one count of manslaughter in the death of Joshua Lockwood. (corroborated by 13 sources) - The accused, Sean Tiessen, is claiming self-defence. (corroborated by 13 sources) - Joshua Lockwood died from a gunshot wound to the chest. (corroborated by 13 sources) - Police seized a .22-calibre semi-automatic pistol magazine containing eight rounds from the Granby Road home. (corroborated by 13 sources) - Sean Tiessen is facing one count of manslaughter (corroborated by 4 sources) - Sean Tiessen is claiming self-defence (corroborated by 4 sources) - The fatal shooting occurred on April 16, 2023 (corroborated by 4 sources) - Joshua Lockwood, 33, died following the incident (corroborated by 4 sources) - Joshua Lockwood and Keera Roberts moved into the home on March 20, 2023 (corroborated by 4 sources) ## Timeline ### 2026-08-21: Sean Tiessen manslaughter trial concludes testimony in Rossland Sean Tiessen, facing manslaughter charges for the 2023 death of Joshua Lockwood, has concluded testimony in Rossland Supreme Court, where he is claiming self-defence. 20 sources. https://clstr.news/cluster/sean-tiessen-manslaughter-trial-continues-in-rossland-supreme-court ### 2026-08-19: Sean Tiessen testifies in Grand Forks manslaughter trial Sean Tiessen is testifying in a Grand Forks area manslaughter trial, claiming self-defence in the 2023 shooting death of Joshua Lockwood. 47 sources. https://clstr.news/cluster/grand-forks-manslaughter-trial-rcmp-details-weapon-search ### 2026-08-12: Sean Tiessen manslaughter trial begins in Rossland Supreme Court The manslaughter trial of Sean Tiessen began in Rossland Supreme Court regarding the 2023 death of Joshua Lockwood in Grand Forks, with the accused claiming self-defence. 3 sources. https://clstr.news/cluster/sean-tiessen-manslaughter-trial-begins-in-rossland-supreme-court --- Cite as: Sean Tiessen manslaughter trial testimony concludes. CLSTR, https://clstr.news/situations/sean-tiessen-manslaughter-trial