It was 7.16pm when Cerven made his way down the path that led him past a playground to the bottom of the hill. He turned right, and walked through the centre of the park, along an alley of lichen-crusted palms towards a marble statue of a writhing family of goats - a gift from China.
At 7.20pm, Cerven sat down on a bench and called police. He asked them to come to the park.