After the attack on Pearl Harbor on December 7, 1941, he sent his new bride, the former Eileen Ito, east to avoid the internment camps, and moved in with fellow Rudy Vallee writer Jess Oppenheimer (who 13 years later would hire his former roommate to write for I Love Lucy).
Weiskopf and his wife Eileen were reunited a few months later when he moved to New York City, where he was hired to write radio comedy for the comedian-actor Fred Allen.
When Weiskopf received a draft notice ordering him to report on June 1, 1942, he requested a two-week delay so that he could finish writing the last two Fred Allen shows of the season.
[citation needed] Weiskopf died in Los Angeles on February 20, 2001; he was survived by his wife, sons Kim and Walt and their grandchildren.
His son Kim Weiskopf, who followed his father into the world of television comedy writing, died of pancreatic cancer at the age of 62 at his home in Encino, California.