The D-C-I this week joined the investigation of a fatal boat crash on West Lake Okoboji. Public Safety Department spokesman Jim Saunders saysthey want to talk to anybody who was out on the lake Thursday August eleventh, and especially later that night around the time the two boats collided, killing one man and sending his wife to the hospital. They want to talk with people who saw someone coming or going during that time at area boat ramps. And he says they’re looking for the boat that ran up and over the other, then fled the scene. Investigators aren’t sure whether it will have a lot of visible damage, though the collision was violent. They’re also looking for anyone who was in the lakes region about that time and returned home with “unexplained injuries.” Saunders says it’s clear the boat they’re looking for in a hit-and-run on the water was going fast. The people on the victim’s boat tell investigators they were going about fifteen or 20 miles an hour and it seems clear the other boat overtook them at a higher speed — though just how fast, they don’t know. 51-year-old Michael Brosnahan of Perry was killed in the crash, and his wife was seriously injured.