Lost orange tabby cat with blue collar

I lost my orange tabby yesterday around 6pm. He's medium-sized, about 10 pounds, with bright orange fur, white paws, and a small white chest patch that looks a bit like a heart. He has a tiny scar above his left ear and a blue collar with a silver bell and a small fish-shaped ID tag. I last saw him near the Clinton Presidential Library and River Market area, along President Clinton Ave, as I called his name and he slipped into a narrow alley toward Main Street. He's very friendly, but he can be shy with strangers. This cat means the world to me; I'm really hoping someone spotted him and can help bring him home.