The background of the suspect is being investigated by authorities. He had previously been referred to the
Prevent programme, an anti-extremism programme developed by the government in an attempt to prevent individuals from becoming radicalized. Louis De Zoysa, aged 23, was arrested on 13 November 2020 on suspicion of murdering a police officer, when he was considered well enough though still requiring hospital treatment after himself being wounded by one of the bullets fired during the shooting. On 29 June 2021, he was deemed well enough to be formally charged with murder. On 28 April 2023, Louis De Zoysa pleaded not guilty to the murder whilst appearing via video link from hospital at Northampton Crown Court. De Zoysa was due to stand trial at Northampton on 6 June 2023. De Zoysa's lawyer argued that De Zoysa, who has
Asperger syndrome, was experiencing an
autistic meltdown at the time of the shooting and was, therefore, not guilty of murder. Following his trial at Northampton Crown Court, De Zoysa was convicted of murder on 23 June 2023. He was sentenced on 27 July 2023 to
life imprisonment with a
whole life order. On 8 May 2025 the court rejected his appeal against his conviction and whole-life term. ==See also==