Kay was running from something, and it showed in how he looked over his shoulder instead of at the Johnson. Nothing happened, and no one was really sure what he was running from, but Kay knew. He just didn't tell.

After a drug deal went south, Kay was blamed by the local mob and ordered to repay them or start having kneecaps bashed and internal organs reposessed. Kay unwillingly turned to shadowrunning because he'd heard about how much money one could make doing it.

Kay made enough to pay off his debts and vanished into the sunset, never to contact any shadowrunners again.