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Elk Grove is a prosperous, sleepy bedroom community north of Chicago.

Physically, it is just over 50 km from the blood-soaked streets of that troubled city. Figuratively, it’s a million miles away.

But on May 7, 1976, it wasn’t the south side that exploded in madness and mayhem – it was Elk Grove.

Inside a tidy suburban ranch home were the bodies of Frank Colombo, 43, his wife, Mary, 41, and their son, Michael, 13. The parents had been shot to death as they slept with a .32-calibre revolver.

Michael was bludgeoned with a bowling trophy and stabbed nearly 100 times. Frank took four bullets in the head. He had been

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