The gunman who shot five people on Thursday in Washington, D.C., was in Orlando days earlier, according to NBC News .
The suspect was speaking in Orlando this week and was preparing to start a new job on Monday, NBC reports.
Federal investigators said the gunman, identified as Matt Lambert, a 55-year-old doctor, shot and killed a man inside a busy gym just after 8 a.m. near Logan Circle.
He fled and shot four more people from his patio in just minutes.
Investigators said Lambert had been in a long-running dispute over the conditions of his condo, and court records show he was locked in litigation over mold and moisture problems in his home.
His attorney, who represented him in a prior case, spoke Thursday on the situation.
"My sense of how he was doing, he was, by all estimates, in a great space, not great facts, but in a great space mentally, as I said," his attorney said. "Just two days ago, he was presenting at a conference on AI and healthcare in Orlando, so he was on his way back from the conference. I wasn't even aware that he was back in D.C."
Investigators said Lambert fatally shot himself while on the phone with police negotiators in his apartment.