Eighteen-year-old Rob Knox had just finished filming his part as Marcus Belby in the sixth Harry Potter film when he was stabbed to death outside a bar in Sidcup, London, in May 2008. The tragedy cut short a promising acting career, but his family turned their grief into action: the Rob Knox Foundation now works to prevent knife crime and educate young people.
Age at death: 18 years · Date of death: 24 May 2008 · Notable role: Marcus Belby in Harry Potter · Killer: Karl Bishop (life imprisonment) · Foundation established: Rob Knox Foundation (2008)
Quick snapshot
- Stabbed on 24 May 2008 in Sidcup (The Guardian (UK news))
- Killed at age 18 (Reuters (international news agency))
- Attacker Karl Bishop convicted (Reuters (international news agency))
- Played Marcus Belby (Wikipedia (biography reference))
- Film released posthumously in 2009 (Wikipedia (film reference))
- Only feature film credit (IMDb (actor profile))
- Trial concluded March 2009 (Reuters (international news agency))
- Life sentence for Bishop (Reuters (international news agency))
- Family campaigned against knife crime (The Guardian (UK news))
- Rob Knox Foundation established (The Rob Knox Foundation (charity site))
- Annual film festival (The Rob Knox Foundation (charity site))
- Educational outreach on knife crime (The Rob Knox Foundation (charity site))
Seven facts, one pattern: the story moves from a brief life and a violent death to a lasting family-led mission against knife crime.
| Label | Value |
|---|---|
| Full name | Robert Arthur Knox |
| Born | 21 August 1989 |
| Died | 24 May 2008 (age 18) |
| Height | 5 ft 10 in (1.78 m) |
| Notable role | Marcus Belby in Harry Potter and the Half-Blood Prince |
| Killer | Karl Bishop (life imprisonment) |
| Foundation | The Rob Knox Foundation (since 2008) |
What happened to Rob Knox?
How did Rob Knox die?
- Rob Knox was stabbed to death outside the Metro Bar in Sidcup, southeast London, on 24 May 2008 (The Guardian (UK news)).
- A court heard he was stabbed five times (The Guardian (UK news)).
- He was trying to protect his younger brother during the incident (Reuters (international news agency)).
Where did the stabbing occur?
- The attack took place outside the Metro Bar in Sidcup, a town in the London Borough of Bexley (Wikipedia (biography reference)).
Who was Karl Bishop?
- Karl Bishop was convicted of murdering Rob Knox at the Old Bailey (Reuters (international news agency)).
- He was sentenced to life imprisonment with a minimum term of 20 years before parole eligibility (Reuters (international news agency)).
The case became a stark symbol of knife crime’s reach: a young actor with a promising future, killed in a minor altercation. The life sentence handed to Bishop sent a clear message, but the Knox family’s focus shifted to prevention.
The implication: the life sentence reflected the severity of the crime, but the foundation turned punishment into prevention.
Who did Rob Knox play Harry Potter?
What was Marcus Belby’s role in the Harry Potter series?
- Rob Knox played Marcus Belby, a Ravenclaw student, in Harry Potter and the Half-Blood Prince (Wikipedia (biography reference)).
- The film was released posthumously in 2009 (Wikipedia (film reference)).
How did Rob Knox get the role?
- He had just finished filming his part shortly before his death (IMDb (film database)).
Knox’s role as a Ravenclaw student was his only feature-film credit, but it forever linked his name to one of the biggest franchises in cinema. The posthumous release gave millions of viewers a final glimpse of his work.
The pattern: a single major role defined his career posthumously.
What is the Rob Knox story?
What was Rob Knox’s early life?
- Rob Knox was born on 21 August 1989 in Kent, England (Wikipedia (biography reference)).
- He attended Beths Grammar School in Bexley (Wikipedia (biography reference)).
How did his death impact his family?
- His parents, Colin and Sally Knox, established the Rob Knox Foundation in 2008 to campaign against knife crime and educate young people (The Rob Knox Foundation (charity site)).
What this means: Rob Knox’s death became a catalyst for change beyond the courtroom.
What movies and TV shows did Rob Knox appear in?
Did Rob Knox appear in any other productions besides Harry Potter?
- He appeared in an episode of the TV series The Bill in 2007 (IMDb (actor profile)).
- His only feature film was Harry Potter and the Half-Blood Prince (The Rob Knox Foundation (biography page)).
The catch: his filmography is short, but his name endures through the foundation.
What is the Rob Knox Foundation?
How does the foundation fight knife crime?
- The foundation educates the public, especially young people, about citizenship, street awareness, and the dangers of knife crime (The Rob Knox Foundation (charity site)).
- It promotes the documentary (K)nox: The Rob Knox Story, which streams on ITVX in the UK (The Rob Knox Foundation (documentary page)).
What is the Rob Knox London Film Festival?
- The foundation runs the annual Rob Knox London Film Festival to showcase young talent and promote positive messages (The Rob Knox Foundation (charity site)).
Despite the foundation’s efforts, knife crime in the UK remains a persistent issue. The documentary reaches a limited audience on ITVX, and the foundation’s resources are small compared to the scale of the problem.
The implication: the foundation’s mission is vital but faces structural challenges.
Timeline of the Rob Knox case
- 21 August 1989 – Rob Knox born in Kent, England (Wikipedia (biography reference))
- 2007 – Appears in TV series The Bill (IMDb (actor profile))
- 2008 – Films Harry Potter and the Half-Blood Prince (IMDb (actor profile))
- 24 May 2008 – Stabbed to death outside the Metro Bar in Sidcup (The Guardian (UK news))
- 4 March 2009 – Karl Bishop convicted of murder (Reuters (international news agency))
- 2009 – Harry Potter and the Half-Blood Prince released posthumously (Wikipedia (film reference))
- 2008 onward – Rob Knox Foundation established; annual film festival runs (The Rob Knox Foundation (charity site))
The pattern: from birth to legacy, the timeline shows a life cut short but a mission that continues.
What we know for sure — and what’s less clear
Confirmed facts
- Rob Knox died from stab wounds on 24 May 2008 (The Guardian (UK news))
- Karl Bishop was found guilty and sentenced to life imprisonment (Reuters (international news agency))
- He played Marcus Belby in the Harry Potter film (Wikipedia (biography reference))
- The Rob Knox Foundation was created by his parents (The Rob Knox Foundation (charity site))
What’s unclear
- The exact number of stab wounds (sources vary between 5 and 6) (The Guardian (UK news))
- The precise trigger of the altercation that led to the stabbing (The Guardian (UK news))
- His burial location is not publicly disclosed (The Rob Knox Foundation (charity site))
- The exact timing of when he finished filming his role is unclear (IMDb (film database))
The catch: these uncertainties do not undermine the core facts of the case.
Voices from the case
[Rob] was a hero who tried to protect his brother.
— Colin Knox, father, quoted in the documentary (K)nox: The Rob Knox Story (The Rob Knox Foundation (documentary page))
We want to ensure no other family has to go through this.
— Sally Knox, mother, from the foundation’s mission statement (The Rob Knox Foundation (charity site))
This was a brutal and senseless killing.
— Mr Justice Saunders, sentencing at the Old Bailey (The Guardian (UK news))
The implication: the judicial system delivered a life sentence, but the family’s fight continues through education and the foundation’s outreach.
robknox.org, en.wikipedia.org, standard.co.uk, robknox.org, theguardian.com, bbc.com
Frequently asked questions
How old was Rob Knox when he died?
Rob Knox was 18 years old when he was killed on 24 May 2008.
What was Rob Knox’s last role?
His last role was Marcus Belby in Harry Potter and the Half-Blood Prince, released posthumously in 2009.
Did Rob Knox have any siblings?
Yes, he had a younger brother, Jamie Knox, whom he was trying to protect during the incident.
How long did the trial of Karl Bishop last?
The trial concluded on 4 March 2009 at the Old Bailey, with the jury deliberating for several hours.
What sentence did Karl Bishop receive?
Karl Bishop was sentenced to life imprisonment with a minimum term of 20 years before parole eligibility.
Where is Rob Knox buried?
Rob Knox is buried in a private family plot in Kent. The exact location is not publicly disclosed.
Is the documentary (K)nox: The Rob Knox Story available on streaming platforms?
Yes, the documentary streams on ITVX in the UK only. It won multiple awards, including Best Feature Documentary at the London Independent Film Festival.
Rob Knox’s story ends not with his death but with the ongoing work of the foundation his family built.
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Craig Newton is Senior Reporter at ScopePress.uk, covering breaking technology news and consumer tech stories across the UK.