A wrap-up of overnight news from the Tribune's breaking news desk:
• Police are investigating four separate shootings that left one man dead and six other people injured in the city late Friday and early this morning. Read more.
• A 31-year-old woman was rescued by firefighters this morning from the frigid waters of Lake Michigan on the North Side. Read more.
• A 24-year-old Chicago man is accused of posting YouTube videos of himself fatally tasing a mouse, cutting off part of a live rat’s tail, and cutting off the ears of another mouse, police said. Read more.