Three more names have been added to a memorial honouring Ontario's fallen police officers, including that of a York Region constable killed in the line of duty last year.

Thousands of officers from across the province gathered in Toronto this morning to pay tribute to their fallen colleagues in the 13th annual Ceremony of Remembrance.

Many laid roses at the memorial just east of Queen's Park, particularly at the spot bearing the name of York Regional Police Const. Garrett Styles.

Styles died on June 28, 2011, after he was dragged and crushed by a minivan driven by a 15-year-old boy.

The names of Nipigon Const. George Armstrong and Port Robinson Const. Charles Richards were also added to the monument.

Armstrong, an Irish immigrant and First World War veteran, was gunned down in 1919 while investigating a break and enter along the Canadian Pacific rail line.

Richards was shot and killed in the village's inn while arresting a man wanted for robbery and murder.

Premier Dalton McGuinty told the solemn crowd words aren't enough to thank officers whose lives are tragically cut short.