Solve the mystery... Win a prize.

Here is a mystery.  It's like playing the game of Clue, but you only have one question to answer and then discuss why.  Since this is a mystery and it's better to have different opinions bouncing off of each others heads...  Rather than having people just give answers...all those who enter into this mystery game and offer good solid clues, advise etc. to solve the mystery, will have their names put into a drawing to win a mystery prize. Saying, "thanks for sharing" or "great post" does not constitute having your name in the drawing.  You have to legitly make an effort to solve the mystery.  Once a reasonable discussion has been made and a conclusion has been reached, I will then post the answer and solution and you all can see how close you came.  Shortly after...all those who participated will be entered into a drawing for a mystery prize.

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The members of the Mervale crime scene unit were still busy in the office of David Travis that November evening when Sergeant Dan Connors came up to Inspector Susan Lieberman to report.

"We haven't found the gun," he said. "Travis was shot at his desk from close range. He was a tax attorney, age 51. William Owens, age 53, who discovered the body, says he was a client of Travis's. He stopped by about quarter to eight this evening to ask Travis about an estate matter. Travis's outer office was dark, but the door was ajar and he saw a light under the inner door office. He says he knocked, pushed open the door, saw Travis slumped over his desk in a puddle of blood, and turned right around and ran to the lobby to call us from a pay phone."

"He expected to find Travis in his office at quarter to eight?" asked Lieberman.

"He says he knew Travis worked late hours."

"Why didn't he call from the phone in the outer office?"

"I asked him that. He said it never occurred to him; he just wanted to get out of there. His call came in at seven forty-eight. I was on patrol at the time and responded, arriving about eight. I accompanied Owens back to the inner office, flipped on the light, and found the body as he described."

Lieberman and Connors stepped aside as the body of Travis was removed.

"Who else in the building has been interviewed?" asked Lieberman.

"There were only two others around. Kate Goggin, 47, is an accountant who works down the hall. Apparently they had an affair several months ago, but he abruptly ended it. She says she saw Travis in the hallway about quarter to seven, and they said hello. About seven-twenty and again about seven-forty, she heard a muffled bang, but assumed each time it was a truck backfiring.

"The other person in the building," Connors continued, "was Russell Stetson, 32, the janitor. We discovered a record of petty theft but he says that was years ago and he's cleaned up his act. He says he emptied Goggin's trash about ten past seven. He didn't see her in her office at the time, but it looked like she had just stepped out. She says she was in the bathroom about that time. He emptied Travis's trash about seven-thirty, he reckons, and Travis was there alive and alone. He says he didn't hear the bangs Goggin referred to, but says he is partly deaf and was doing some vacuuming as well as collecting trash. About a quarter to eight, he went down to the lobby and saw Owens at the pay phone, though Owens did not notice him. Stetson proceeded to the basement to bag the trash. That's where we found him."

"Interesting." Lieberman sighed and looked around the cluttered inner office. "There are offices on all three floors of this building, I suppose, and no security guard."

"That's right."

"Thank you, sergeant. The fingerprint report should be helpful, and I think I know whom it will implicate."

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Question:

Whom does Inspector Lieberman suspect?  Why?

William Owens
Kate Goggin
Russell Stetson
Not Sure