An examination of the death of high school student Isabel Warren, who was killed when the wall of a public washroom collapsed, has begun in Guelph.

The City of Guelph, a local architect and an engineer are charged in the case.

They're accused of negligence in the design and construction of the washroom wall that collapsed on Warren in June 2009.

The 14-year-old died of head and chest injuries after the wall in the washroom at Larry Pearson Park fell on her.

The death led to the closure of a number of public washrooms and concessions in the city for repairs.

Pre-trial motions are expected to take the rest of the week and three weeks have been set aside to examine evidence.

However, defence attorneys contend the Ministry of Labour waited too long to bring the charges and they should be thrown out.

A lawsuit filed by Warren's family was settled out of court in 2011.