I also remember April 30 had crazy weather in Chicago--because i was out in it. Mild day but then around 5pm total downpour, hail, thunder, lightening, it was crazy, some areas outside of the city even had spotted tornadoes. I'm thinking, were they at the beach and got swept out into the water during this crazy storm? It would not really have been warm enough to swim in Lake Michigan right now though. There is no bridge up in that area to jump off of (if they were committing suicide by jumping into the lake together.) It's really just parks and beaches, maybe some piers that are not very high up.