A Victoria Police computer has been used to heavily edit a Wikipedia page about the death of 15-year-old Tyler Cassidy, removing sentences critical of the force's handling of the incident in which he was shot and killed.

The edits are among hundreds recorded on Wikipedia pages from Internet Protocol addresses registered to Victoria Police, an investigation by Fairfax Media has revealed.

Tyler Cassidy, who was shot dead at a skate park in the All Nations Park in Northcote.

Tyler Cassidy was shot by police at the All Nations skate park near Northcote Plaza in December 2008 after he ran at police brandishing two knives, sparking claims that police had overreacted. A coronial investigation cleared police of wrongdoing, but found that police should significantly improve training on dealing with vulnerable young people.

The Wikipedia page about the incident, titled Death of Tyler Cassidy, has been edited anonymously 17 times from an IP address registered to the Victoria Police network.