The Case of the Quadruplets

Tad, Brad, Shad, and Chad were sitting on several chairs in their living room. Detective Davis slowly paced around them as he proceeded to talk about the case.
“As you know, Misty Myers was found dead in her apartment last week. A neighbor reported seeing someone who resembled one of you leave the area near the time of her death. I want to know who saw her last!”
“I don’t know,” Tad replied nervously. “It wasn’t me!”
“Don’t try to rattle us!” Brad snapped at Davis. “It won’t work. I know my rights. I don’t have to say anything to you if I don’t want to.”
“It’s true that Misty was a friend of ours,” Shad said. “And we’re all sorry that she has passed on.”
“She was more than a friend,” Chad said. “Why don’t we just admit it? She had an affair with all of us once. That’s the way she wanted it. She was obsessed with us because we were quadruplets and we made her fantasies become real.”
“How dare you talk about her like that!” Tad shouted at his brother. “She was more than just that to me!”
“Suppose we get to the subject of alibis,” Davis interrupted. “Where were each of you on the day of her unfortunate demise?”
“I don’t have any problem answering that,” Brad replied. “I was at the library all day doing some research. I didn’t do it. I was busy with my studies.”
“I was doing some shopping,” Tad said. “Yes, I visited several stores at the mall. I’m sure that someone there could vouch for me. Later, I went out to a few bars.”
“I was online at my girlfriend’s house,” Shad answered. “I couldn’t have done it anyway. I slept in until 10.”
“I was at the Wet Spot getting wasted,” Chad replied with a yawn. “I also watched a lot of TV at my apartment that evening. I didn’t do it, I could hardly walk straight.”
Later, Moreno asked his partner, “Do you have any leads?”
“They all look the same, but one of them does look guiltier than the others.”

WHO DID DAVIS SUSPECT?

THE ANSWER
Davis suspected Shad. The detective never mentioned what time of day the murder occurred. When Shad mentioned that he had “slept in until 10,” he was the only brother who specifically gave an alibi for what he had been doing in the morning. The other brothers only assumed that the murder had taken place later in the day and gave their alibis for the afternoon and evening. As it turned out, Shad’s explanation was a little too pat and he became the primary suspect in the investigation.