Prosecutors in the Brian Walshe trial called a key witness to the stand Thursday morning — William Fastow — the man Walshe’s wife, Ana, was having an affair with when she died.

Fastow is a real estate broker in Washington, D.C., who met the Walshes when he sold them a townhouse in the nation’s capital in 2022. At the time, Ana Walshe was working in D.C. after getting a job at Tishman Speyer, a global property management firm.

On the stand Thursday morning, Fastow said he and Ana Walshe quickly hit it off — becoming friends, then confidantes and eventually beginning a romantic relationship. Fastow, who was separated, said he and Walshe “would share conversations about our lives, what we were going through, personal troubles.”

They saw each other two to three times a week, including on

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