The accident was caused by congested traffic during the procession around 3 p.m. at Jamieson and Lansdowne Avenues. It involved two officers on police motorcycles, one from St. Charles County and the other Webster Groves.
Vehicles and officers from a number of departments across the St. Louis Metro area were invovled in the procession.
A Facebook live video shows the two motorcycles laying on the ground, with one of the injured officers receiving aid from first responders who were nearby.
Arrangements for Langsdorf were announced this week, with visitation on Sunday at Hoffmeister Colonial Mortuary in St. Louis, from noon to 6 p.m. The funeral will happen Monday at the Cathedral Basilica of St. Louis at 10 a.m., followed by his burial at Resurrection Cemetery.
Bonette Kymbrelle Meeks, 26, was charged Monday with first-degree murder, armed criminal action, unlawful possession of a firearm and resisting arrest. Meeks is jailed without bond and does not yet have a listed attorney.