#3. Who is the murderer?

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These are the clues you have to figure it out:

One of them shot and killed one of the other 5.
Dan ran in the NYC Marathon yesterday with one of the innocent men.
Mike considered being a farmer before he moved to the city.
Jeff is a top-notch computer consultant and wants to install Ben’s new computer next week.
The murderer had his leg amputated last month.
Ben met Jack for the first time 6 months ago.
Jack has been in seclusion since the crime.
Dan used to drink heavily.
Ben and Jeff built their last computers together.
The murderer is Jack’s brother. They grew up together in Seattle.