Mystery

The time of death had been firmly established. At 10:06 PM, all three suspects said they heard a gunshot echo through the house. The house was shared by four graduate students; one of which lay dead in his second story bedroom, a bullet in his chest.

Harry, it seemed, had been a ladies man. He had even bragged about seducing one of his roommates girlfriends. Unfortunately for the detectives, they didn't know which one. They separated the three remaining housemates and interviewed each one.

"I was working on my car," Bill insisted. "I plugged an extension cord into an outlet behind the house. Then I took a work light around to the side driveway, in front of the garage. When I heard a gunshot, it took me a moment to realize it came from within the house. Then I ran inside."

The second suspect entered the room with a noticeable limp.

"I had just come home," explained Sonny. "I parked in the alley behind the house. I was walking up to the back door when I tripped hard over some cord. I fell down, then just sat there, nursing my ankle. Maybe two minutes later came the gunshot. That got me moving."

The third suspect claimed that he had just come down to the kitchen. "I was starting to scoop out a bowl of ice cream," said Glen. "Then I heard a noise out back. I looked out, but it was dark. I went back to my ice cream. A couple minutes later, I heard the shot."

The detectives circled the house. In the kitchen, they found a melted bowl of ice cream on the counter by the fridge. In the backyard, they saw an orange extension cord with a bent prong that had been ripped from an outdoor socket. Following the extension cord, they found Bill's car in front of the garage, the work light suspended over the open hood.

"It's pretty clear who's lying," the chief detective said as he went in to make the arrest.

Who did the chief detective think was lying and why?